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(Appendix E:   Kinetic Energy Components)
(Riemann S-Type Ellipsoids)
 
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=Steady-State 2<sup>nd</sup>-Order Tensor Virial Equations=
=Steady-State 2<sup>nd</sup>-Order Tensor Virial Equations=
-
 
-
By satisfying all six &#8212; not necessarily unique &#8212; components of the Second-Order Tensor Virial Equation, the entire set of Riemann Ellipsoids can be determined.
 
{{LSU_HBook_header}}
{{LSU_HBook_header}}
-
Here we are only interested in determining the equilibrium conditions of uniform-density ellipsoids that have semi-axes, <math>~a_1, a_2, a_3</math>.
+
==Summary==
 +
 
 +
Drawing from our [[User:Tohline/VE#Virial_Equations_.28Rotating_Frame.29|accompanying discussion of virial equations as viewed from a rotating frame of reference]], here we employ the 2<sup>nd</sup>-order tensor virial equation (TVE),
 +
<table border="0" cellpadding="5" align="center">
 +
<tr>
 +
  <td align="right">
 +
<math>~0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
2 \mathfrak{T}_{ij} + \mathfrak{W}_{ij} + \delta_{ij}\Pi
 +
+ \Omega^2 I_{ij} - \Omega_i\Omega_k I_{kj} + 2\epsilon_{ilm}\Omega_m \int_V \rho u_lx_j dx \, ,
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
to determine the equilibrium conditions of uniform-density <math>~(\rho)</math> ellipsoids that have semi-axes, <math>~(a_1, a_2, a_3) \leftrightarrow (a, b, c),</math> and an internal velocity field, <math>~\vec{u}</math>  (as [[#Adopted_.28Internal.29_Velocity_Field|prescribed below]]), that preserves this specified ellipsoidal shape, as viewed from a frame of reference that is rotating with angular velocity, <math>~\vec\Omega</math>.  Because each of the indices, <math>~i</math> and <math>~j</math>, run from 1 to 3, inclusive, this TVE appears to provide nine equilibrium constraints; and once the values of the density and the three semi-axes are specified, there appear to be seven unknowns:  <math>~\Pi</math> and the three pairs of velocity-field components <math>~(\Omega_1, \zeta_1)</math>, <math>~(\Omega_2, \zeta_2)</math>, <math>~(\Omega_3, \zeta_3).</math>  In practice, however, only five constraints are relevant/independent because, as is encapsulated in &hellip;
 +
<table border="0" width="60%" align="center" cellpadding="10"><tr><td align="left">
 +
<div align="center"><font color="maroon">'''Riemann's Fundamental Theorem'''</font></div>
 +
<font color="darkgreen">&hellip; non-trivial solutions are obtained only if no more than two of the three pairs of velocity-field components are different from zero.</font>
 +
</td></tr></table>
 +
<span id="SummaryTable">Following EFE</span>, we will set <math>~\Omega_1 = \zeta_1 = 0</math>, in which case the only applicable TVE constraint relations are the five identified in the following table of equations.
 +
 
 +
 
 +
<table border="1" align="center" cellpadding="5">
 +
<tr>
 +
  <td align="center" colspan="2">Indices</td>
 +
  <td align="center" rowspan="2">Each Associated 2<sup>nd</sup>-Order TVE Expression</td>
 +
</tr>
 +
<tr>
 +
  <td align="center" width="5%"><math>~i</math></td>
 +
  <td align="center" width="5%"><math>~j</math></td>
 +
</tr>
 +
<tr>
 +
  <td align="center"><math>~1</math></td>
 +
  <td align="center"><math>~1</math></td>
 +
  <td align="left">
 +
 
 +
<table align="left" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \frac{3\cdot 5}{2^2\pi a b c\rho} \biggr] \Pi
 +
+\biggl\{
 +
( \Omega_2^2 + \Omega_3^2) 
 +
+ 2  \biggl[ \frac{b^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3
 +
+ 2  \biggl[ \frac{c^2}{c^2 + a^2}\biggr]\Omega_2 \zeta_2
 +
~-~(2\pi G\rho) A_1
 +
\biggr\} a^2
 +
+ \biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 b^2
 +
+ \biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \zeta_2^2  c^2 
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="center"><math>~2</math></td>
 +
  <td align="center"><math>~2</math></td>
 +
  <td align="left">
 +
 
 +
<table align="left" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \frac{3\cdot 5}{2^2\pi a b c \rho} \biggr]\Pi
 +
+ \biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \zeta_3^2 a^2
 +
+ \biggl\{
 +
\Omega_3^2 
 +
+ 2 \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3 
 +
~-~( 2\pi G \rho) A_2
 +
\biggr\}b^2
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="center"><math>~3</math></td>
 +
  <td align="center"><math>~3</math></td>
 +
  <td align="left">
 +
 
 +
<table align="left" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \frac{3\cdot 5}{2^2\pi abc\rho} \biggr]\Pi
 +
+ \biggl[ \frac{c^2}{c^2 + a^2}\biggr]^2 \zeta_2^2  a^2
 +
+ \biggl\{
 +
\Omega_2^2  + 2 \biggl[ \frac{a^2}{a^2+c^2}\biggr]\Omega_2 \zeta_2
 +
- (2\pi G \rho)A_3
 +
\biggr\}c^2
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="center"><math>~2</math></td>
 +
  <td align="center"><math>~3</math></td>
 +
  <td align="left">
 +
 
 +
<table align="left" border=0 cellpadding="3">
 +
 
 +
<tr>
 +
  <td align="right">
 +
<math>~0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\biggl\{
 +
 +
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{a^2}{a^2 + c^2 }\biggr] \biggl[ 2 + \frac{\zeta_3}{\Omega_3}\biggl( \frac{b^2}{b^2+a^2}\biggr) \biggr]   
 +
\biggr\} \Omega_2\Omega_3c^2
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="center"><math>~3</math></td>
 +
  <td align="center"><math>~2</math></td>
 +
  <td align="left">
 +
 
 +
<table align="left" border=0 cellpadding="3">
 +
 
 +
<tr>
 +
  <td align="right">
 +
<math>~0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\biggl\{
 +
 +
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{a^2}{a^2+b^2}\biggr]  \biggl[2 +  \frac{\zeta_2}{\Omega_2} \biggl( \frac{c^2}{c^2 + a^2} \biggr) \biggr] 
 +
\biggr\} \Omega_2 \Omega_3b^2
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 
 +
  </td>
 +
</tr>
 +
</table>
==General Coefficient Expressions==
==General Coefficient Expressions==
-
As has been detailed in an [[User:Tohline/ThreeDimensionalConfigurations/HomogeneousEllipsoids#Gravitational_Potential|accompanying chapter]], the gravitational potential anywhere inside or on the surface, <math>~(a_1,a_2,a_3)</math>, of an homogeneous ellipsoid may be given analytically in terms of the following three coefficient expressions:
+
In the context of our discussion of configurations that are triaxial ellipsoids, we begin by adopting the <math>~(\ell, m, s)</math> subscript notation to identify which semi-axis length is the (largest, medium-length, smallest).  As has been detailed in an [[User:Tohline/ThreeDimensionalConfigurations/HomogeneousEllipsoids#Derivation_of_Expressions_for_Ai|accompanying chapter]], the gravitational potential anywhere inside or on the surface of an homogeneous ellipsoid may be given analytically in terms of the following three coefficient expressions:
 +
<div align="center">
 +
<table align="center" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>
 +
~\frac{A_\ell}{a_\ell a_m a_s}
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>
 +
~=
 +
</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\frac{2}{a_\ell^3}
 +
\biggl[  \frac{F(\theta,k) - E(\theta,k)}{k^2 \sin^3\theta} \biggr] \, ,
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
<math>
 +
~\frac{A_s}{a_\ell a_m a_s}
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>
 +
~=
 +
</math>
 +
  </td>
 +
  <td align="left">
 +
<math>
 +
~\frac{2}{a_\ell^3} \biggl[  \frac{(a_m/a_s) \sin\theta - E(\theta,k)}{(1-k^2) \sin^3\theta} \biggr] \, ,
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
<math>
 +
~\frac{A_m}{a_\ell a_m a_s} = \frac{2 - (A_\ell + A_s)}{a_\ell a_m a_s}
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>
 +
~=
 +
</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\frac{ 2}{a_\ell^3 }
 +
\biggl[ \frac{
 +
E(\theta, k)
 +
-~(1-k^2)
 +
F(\theta, k)
 +
-~(a_s/a_m)k^2\sin\theta}{k^2 (1-k^2)\sin^3\theta}
 +
\biggr] \, ,
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
</table>
 +
</div>
 +
where, <math>~F(\theta,k)</math> and <math>~E(\theta,k)</math> are incomplete elliptic integrals of the first and second kind, respectively, with arguments,
 +
<div align="center">
 +
<table border="0" cellpadding="5" align="center">
 +
 
 +
<tr>
 +
  <td align="right">
 +
<math>~\theta = \cos^{-1} \biggl(\frac{a_s}{a_\ell} \biggr)</math>
 +
  </td>
 +
  <td align="center">
 +
&nbsp; &nbsp; &nbsp; and &nbsp; &nbsp; &nbsp;
 +
  </td>
 +
  <td align="left">
 +
<math>~k = \biggl[\frac{1 - (a_m/a_\ell)^2}{1 - (a_s/a_\ell)^2} \biggr]^{1/2} \, .</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
</div>
 +
 
 +
===Specific Case of a<sub>1</sub> > a<sub>2</sub> > a<sub>3</sub>===
 +
 
 +
When we discuss configurations in which <math>~a_1 > a_2 > a_3 > 0</math>  &#8212; such as Jacobi, Dedekind, or ''most'' Riemann S-Type ellipsoids &#8212; we must adopt the associations, <math>~(A_1, a_1) \leftrightarrow (A_\ell, a_\ell)</math>, <math>~(A_2, a_2) \leftrightarrow (A_m, a_m)</math>, and <math>~(A_3, a_3) \leftrightarrow (A_s, a_s)</math>.  This means that the coefficients, <math>~A_1</math>, <math>~A_2</math>, and <math>~A_3</math> are defined by the expressions,
<div align="center">
<div align="center">
<table align="center" border=0 cellpadding="3">
<table align="center" border=0 cellpadding="3">
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</table>
</table>
</div>
</div>
-
where, <math>~F(\theta,k)</math> and <math>~E(\theta,k)</math> are incomplete elliptic integrals of the first and second kind, respectively, with arguments,
+
where, the arguments of the incomplete elliptic integrals are,
<div align="center">
<div align="center">
<table border="0" cellpadding="5" align="center">
<table border="0" cellpadding="5" align="center">
Line 87: Line 350:
</table>
</table>
</div>
</div>
 +
 +
===Specific Case of a<sub>1</sub> > a<sub>3</sub> > a<sub>2</sub>===
 +
 +
When we discuss configurations in which <math>~a_1 > a_3 > a_2 > 0</math>  &#8212; these are usually referred to in [[User:Tohline/Appendix/References#EFE|EFE]] as prolate S-Type Riemann ellipsoids  &#8212; we must instead adopt the associations, <math>~(A_1, a_1) \leftrightarrow (A_\ell, a_\ell)</math>, <math>~(A_2, a_2) \leftrightarrow (A_s, a_s)</math>, and <math>~(A_3, a_3) \leftrightarrow (A_m, a_m)</math>.  This means that the coefficients, <math>~A_1</math>, <math>~A_2</math>, and <math>~A_3</math> are defined by the expressions,
 +
<div align="center">
 +
<table align="center" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>
 +
~A_1
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>
 +
~=
 +
</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~2 \biggl( \frac{a_2}{a_1} \biggr)\biggl( \frac{a_3}{a_1} \biggr)
 +
\biggl[  \frac{F(\theta,k) - E(\theta,k)}{k^2 \sin^3\theta} \biggr] \, ,
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
<math>
 +
~A_2
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>
 +
~=
 +
</math>
 +
  </td>
 +
  <td align="left">
 +
<math>
 +
~2 \biggl( \frac{a_3}{a_1} \biggr) \biggl[  \frac{(a_3/a_1) \sin\theta - (a_2/a_1)E(\theta,k)}{(1-k^2) \sin^3\theta} \biggr] \, ,
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
<math>
 +
~A_3 = 2 - (A_1 + A_2)
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>
 +
~=
 +
</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\frac{2a_2 a_3}{a_1^2}
 +
\biggl[ \frac{
 +
E(\theta, k)
 +
-~(1-k^2)
 +
F(\theta, k)
 +
-~(a_2/a_3)k^2\sin\theta}{k^2 (1-k^2)\sin^3\theta}
 +
\biggr] \, ,
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
</table>
 +
</div>
 +
where, the arguments of the incomplete elliptic integrals of the first and second kind are,
 +
<div align="center">
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\theta = \cos^{-1} \biggl(\frac{a_2}{a_1} \biggr)</math>
 +
  </td>
 +
  <td align="center">
 +
&nbsp; &nbsp; &nbsp; and &nbsp; &nbsp; &nbsp;
 +
  </td>
 +
  <td align="left">
 +
<math>~k = \biggl[\frac{1 - (a_3/a_1)^2}{1 - (a_2/a_1)^2} \biggr]^{1/2} \, .</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 7, &sect;48d, footnote to Table VII (p. 143)</font> ]</td></tr>
 +
</table>
 +
</div>
 +
NOTE:  All ''irrotational'' ellipsoids belong to this category of configurations.
 +
 +
===Specific Case of a<sub>2</sub> > a<sub>1</sub> > a<sub>3</sub>===
 +
 +
When we discuss configurations in which <math>~a_2 > a_1 > a_3 > 0</math>  &#8212; for example, ''most'' Riemann ellipsoids of Types I, II, &amp; III &#8212; we must instead adopt the associations, <math>~(A_1, a_1) \leftrightarrow (A_m, a_m)</math>, <math>~(A_2, a_2) \leftrightarrow (A_\ell, a_\ell)</math>, and <math>~(A_3, a_3) \leftrightarrow (A_s, a_s)</math>.  This means that the coefficients, <math>~A_1</math>, <math>~A_2</math>, and <math>~A_3</math> are defined by the expressions,
 +
<div align="center">
 +
<table align="center" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>
 +
~A_2
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>
 +
~=
 +
</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~2 \biggl( \frac{a_1}{a_2} \biggr)\biggl( \frac{a_3}{a_2} \biggr)
 +
\biggl[  \frac{F(\theta,k) - E(\theta,k)}{k^2 \sin^3\theta} \biggr] \, ,
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
<math>
 +
~A_3
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>
 +
~=
 +
</math>
 +
  </td>
 +
  <td align="left">
 +
<math>
 +
~2\biggl( \frac{a_1}{a_2}\biggr) \biggl[  \frac{(a_1/a_2) \sin\theta - (a_3/a_2)E(\theta,k)}{(1-k^2) \sin^3\theta} \biggr]  \, ,
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
<math>
 +
~A_1 = 2 - (A_2 + A_3)
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>
 +
~=
 +
</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\frac{ 2a_1 a_3}{a_2^2 }
 +
\biggl[ \frac{
 +
E(\theta, k)
 +
-~(1-k^2)
 +
F(\theta, k)
 +
-~(a_3/a_1)k^2\sin\theta}{k^2 (1-k^2)\sin^3\theta}
 +
\biggr] \, ,
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
</table>
 +
</div>
 +
where, the arguments of the incomplete elliptic integrals are,
 +
<div align="center">
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\theta = \cos^{-1} \biggl(\frac{a_3}{a_2} \biggr)</math>
 +
  </td>
 +
  <td align="center">
 +
&nbsp; &nbsp; &nbsp; and &nbsp; &nbsp; &nbsp;
 +
  </td>
 +
  <td align="left">
 +
<math>~k = \biggl[\frac{1 - (a_1/a_2)^2}{1 - (a_3/a_2)^2} \biggr]^{1/2} \, .</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
</div>
 +
 +
===Oblate Spheroids [a<sub>2</sub> = a<sub>1</sub> > a<sub>3</sub>]===
 +
 +
Starting with the case of <math>~a_2 > a_1 > a_3 > 0</math>  and setting <math>~a_2 = a_1</math>, we recognize, first, that <math>~k = 0</math>.  Hence, we have,
 +
 +
<table align="center" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>
 +
~A_3
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>
 +
~=
 +
</math>
 +
  </td>
 +
  <td align="left">
 +
<math>
 +
~2\biggl[  \frac{ \sin\theta - (a_3/a_1)E(\theta,0)}{\sin^3\theta} \biggr]  \, ,
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
==Adopted (Internal) Velocity Field==
==Adopted (Internal) Velocity Field==
Line 203: Line 662:
</table>
</table>
-
<font color="#007700">is the moment of inertia tensor.</font>
+
<font color="#007700">is the moment of inertia tensor.</font> Expressions for all nine components of the kinetic energy tensor, <math>~\mathfrak{T}_{ij}</math> are derived in [[#Appendix_E:_.C2.A0_Kinetic_Energy_Components|Appendix E]], below; and expressions for each of the six Coriolis components can be found in [[#Appendix_B:_.C2.A0Coriolis_Component_u1x2|Appendices B, C, &amp; D]].
===The Three Diagonal Elements===
===The Three Diagonal Elements===
Line 218: Line 677:
<math>~
<math>~
2 \mathfrak{T}_{11} + \mathfrak{W}_{11} + \Pi  
2 \mathfrak{T}_{11} + \mathfrak{W}_{11} + \Pi  
-
+ \Omega^2 I_{11} - \Omega_1\Omega_k I_{k1} + 2\epsilon_{1lm}\Omega_m \int_V \rho u_lx_1 dx
+
+ \Omega^2 I_{11} - \Omega_1\Omega_k I_{k1} + 2\epsilon_{1lm}\Omega_m \int_V \rho u_lx_1 d^3x
</math>
</math>
   </td>
   </td>
</tr>
</tr>
 +
<tr>
<tr>
   <td align="right">
   <td align="right">
Line 233: Line 693:
2 \mathfrak{T}_{11} + \mathfrak{W}_{11} + \Pi + \Omega^2 I_{11}  
2 \mathfrak{T}_{11} + \mathfrak{W}_{11} + \Pi + \Omega^2 I_{11}  
- \Omega_1^2I_{11}  
- \Omega_1^2I_{11}  
-
+ 2 \Omega_3 \int_V \rho u_2x_1 dx
+
+ 2 \Omega_3 \int_V \rho u_2x_1 ~d^3x
-
- 2\Omega_2 \int_V \rho u_3x_1 dx
+
- 2\Omega_2 \int_V \rho u_3x_1 ~d^3x
</math>
</math>
   </td>
   </td>
</tr>
</tr>
 +
<tr>
<tr>
   <td align="right">
   <td align="right">
Line 249: Line 710:
2 \mathfrak{T}_{11} + \mathfrak{W}_{11} + \Pi  
2 \mathfrak{T}_{11} + \mathfrak{W}_{11} + \Pi  
+( \Omega_2^2 + \Omega_3^2) I_{11}  
+( \Omega_2^2 + \Omega_3^2) I_{11}  
-
+ 2 \Omega_3 \int_V \rho u_2x_1 dx
+
+ 2 \Omega_3\rho \int_V u_2x ~d^3x
-
- 2\Omega_2 \int_V \rho u_3x_1 dx
+
- 2\Omega_2\rho \int_V  u_3 x~ d^3x
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 I_{22}
 +
+
 +
\biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \zeta_2^2 I_{33} 
 +
~-~(2\pi G\rho) A_1 I_{11} + \Pi
 +
+( \Omega_2^2 + \Omega_3^2) I_{11}
 +
+ 2  \biggl[ \frac{b^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3 I_{11}
 +
+ 2  \biggl[ \frac{c^2}{c^2 + a^2}\biggr]\Omega_2 \zeta_2 I_{11}
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\Pi
 +
+ \biggl\{
 +
( \Omega_2^2 + \Omega_3^2) 
 +
+ 2  \biggl[ \frac{b^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3
 +
+ 2  \biggl[ \frac{c^2}{c^2 + a^2}\biggr]\Omega_2 \zeta_2
 +
~-~(2\pi G\rho) A_1
 +
\biggr\} I_{11}
 +
+
 +
\biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 I_{22}
 +
+
 +
\biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \zeta_2^2 I_{33} 
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
<math>~\Rightarrow~~~ -\biggl[ \frac{3\cdot 5}{2^2\pi a b c\rho} \biggr] \Pi</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl\{
 +
( \Omega_2^2 + \Omega_3^2) 
 +
+ 2  \biggl[ \frac{b^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3
 +
+ 2  \biggl[ \frac{c^2}{c^2 + a^2}\biggr]\Omega_2 \zeta_2
 +
~-~(2\pi G\rho) A_1
 +
\biggr\} a^2
 +
+ \biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 b^2
 +
+ \biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \zeta_2^2  c^2  \, .
</math>
</math>
   </td>
   </td>
Line 256: Line 782:
</table>
</table>
-
Similarly, for <math>~i = j = 2</math>,
+
Once we choose the values of the (semi) axis lengths <math>~(a, b, c)</math> of an ellipsoid &#8212; from which the value of <math>~A_1</math> can be immediately determined &#8212; along with a specification of <math>~\rho</math>, this equation has the following five unknowns:  <math>~\Pi, \Omega_2, \Omega_3,  \zeta_2, \zeta_3</math>.  Similarly, for <math>~i = j = 2</math>,
 +
 
<table border="0" cellpadding="5" align="center">
<table border="0" cellpadding="5" align="center">
<tr>
<tr>
Line 268: Line 795:
<math>~
<math>~
2 \mathfrak{T}_{22} + \mathfrak{W}_{22} + \Pi  
2 \mathfrak{T}_{22} + \mathfrak{W}_{22} + \Pi  
-
+ \Omega^2 I_{22} - \Omega_2\Omega_k I_{k2} + 2\epsilon_{2lm}\Omega_m \int_V \rho u_lx_2 dx
+
+ \Omega^2 I_{22} - \Omega_2\Omega_k I_{k2} + 2\epsilon_{2lm}\Omega_m \int_V \rho u_lx_2 d^3x
</math>
</math>
   </td>
   </td>
Line 283: Line 810:
<math>~
<math>~
2 \mathfrak{T}_{22} + \mathfrak{W}_{22} + \Pi  
2 \mathfrak{T}_{22} + \mathfrak{W}_{22} + \Pi  
-
+ (\Omega_1^2 + \Omega_3^2) I_{22} + 2\Omega_1 \int_V \rho u_3x_2 dx
+
+ (\Omega_1^2 + \Omega_3^2) I_{22} + 2\Omega_1 \rho \int_V u_3 y ~d^3x
-
- 2\Omega_3 \int_V \rho u_1x_2 dx
+
- 2\Omega_3 \rho \int_V u_1 y ~d^3x
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \frac{b^2}{b^2 + c^2}\biggr]^2 \zeta_1^2  I_{33}
 +
+
 +
\biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \zeta_3^2 I_{11}
 +
~-~( 2\pi G \rho) A_2 {I}_{22}
 +
+ \Pi
 +
+ (\Omega_1^2 + \Omega_3^2) I_{22}
 +
+ 2 \biggl[ \frac{c^2}{c^2+b^2}\biggr]\Omega_1 \zeta_1 I_{22}
 +
+ 2 \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3  I_{22}
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\Pi
 +
+
 +
\biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \zeta_3^2 I_{11}
 +
+ \biggl\{
 +
(\Omega_1^2 + \Omega_3^2) 
 +
+ 2 \biggl[ \frac{c^2}{c^2+b^2}\biggr]\Omega_1 \zeta_1 
 +
+ 2 \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3 
 +
~-~( 2\pi G \rho) A_2
 +
\biggr\}{I}_{22}
 +
+ \biggl[ \frac{b^2}{b^2 + c^2}\biggr]^2 \zeta_1^2  I_{33}
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
<math>~\Rightarrow~~~-\biggl[ \frac{3\cdot 5}{2^2\pi a b c \rho} \biggr]\Pi</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \zeta_3^2 a^2
 +
+ \biggl\{
 +
(\Omega_1^2 + \Omega_3^2) 
 +
+ 2 \biggl[ \frac{c^2}{c^2+b^2}\biggr]\Omega_1 \zeta_1 
 +
+ 2 \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3 
 +
~-~( 2\pi G \rho) A_2
 +
\biggr\}b^2
 +
+ \biggl[ \frac{b^2}{b^2 + c^2}\biggr]^2 \zeta_1^2  c^2 \, .
</math>
</math>
   </td>
   </td>
</tr>
</tr>
</table>
</table>
-
and, for <math>~i=j=3</math>,
+
 
 +
This gives us a second equation, but an additional pair of (for a total of seven) unknowns:  <math>~\Omega_1, \zeta_1</math>.  For the third diagonal element &#8212; that is, for <math>~i=j=3</math> &#8212; we have,
<table border="0" cellpadding="5" align="center">
<table border="0" cellpadding="5" align="center">
Line 302: Line 895:
<math>~
<math>~
2 \mathfrak{T}_{33} + \mathfrak{W}_{33} + \Pi  
2 \mathfrak{T}_{33} + \mathfrak{W}_{33} + \Pi  
-
+ \Omega^2 I_{33} - \Omega_3\Omega_k I_{k3} + 2\epsilon_{3lm}\Omega_m \int_V \rho u_lx_3 dx
+
+ \Omega^2 I_{33} - \Omega_3\Omega_k I_{k3} + 2\epsilon_{3lm}\Omega_m \int_V \rho u_lx_3 ~d^3x
</math>
</math>
   </td>
   </td>
Line 317: Line 910:
<math>~
<math>~
2 \mathfrak{T}_{33} + \mathfrak{W}_{33} + \Pi  
2 \mathfrak{T}_{33} + \mathfrak{W}_{33} + \Pi  
-
+ (\Omega_1^2 + \Omega_2^2) I_{33}  + 2\Omega_2 \int_V \rho u_1x_3 dx
+
+ (\Omega_1^2 + \Omega_2^2) I_{33}  + 2\Omega_2 \rho \int_V u_1 z ~d^3x
-
- 2\Omega_1 \int_V \rho u_2 x_3 dx
+
- 2\Omega_1 \rho \int_V u_2 z ~d^3x
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\biggl[ \frac{c^2}{c^2 + a^2}\biggr]^2 \zeta_2^2  I_{11}
 +
+
 +
\biggl[ \frac{c^2}{c^2+b^2}\biggr]^2 \zeta_1^2 I_{22}
 +
- (2\pi G \rho)A_3 I_{33} + \Pi
 +
+ (\Omega_1^2 + \Omega_2^2) I_{33}  + 2 \biggl[ \frac{a^2}{a^2+c^2}\biggr]\Omega_2 \zeta_2 I_{33}
 +
+ 2 \biggl[\frac{b^2}{b^2 + c^2}\biggr] \Omega_1 \zeta_1 I_{33}
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\Pi
 +
+
 +
\biggl[ \frac{c^2}{c^2 + a^2}\biggr]^2 \zeta_2^2  I_{11}
 +
+
 +
\biggl[ \frac{c^2}{c^2+b^2}\biggr]^2 \zeta_1^2 I_{22}
 +
+ \biggl\{
 +
(\Omega_1^2 + \Omega_2^2)  + 2 \biggl[ \frac{a^2}{a^2+c^2}\biggr]\Omega_2 \zeta_2
 +
+ 2 \biggl[\frac{b^2}{b^2 + c^2}\biggr] \Omega_1 \zeta_1 
 +
- (2\pi G \rho)A_3
 +
\biggr\}I_{33}
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
<math>~\Rightarrow ~~~ -\biggl[ \frac{3\cdot 5}{2^2\pi abc\rho} \biggr]\Pi</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \frac{c^2}{c^2 + a^2}\biggr]^2 \zeta_2^2  a^2
 +
+
 +
\biggl[ \frac{c^2}{c^2+b^2}\biggr]^2 \zeta_1^2 b^2
 +
+ \biggl\{
 +
(\Omega_1^2 + \Omega_2^2)  + 2 \biggl[ \frac{a^2}{a^2+c^2}\biggr]\Omega_2 \zeta_2
 +
+ 2 \biggl[\frac{b^2}{b^2 + c^2}\biggr] \Omega_1 \zeta_1 
 +
- (2\pi G \rho)A_3
 +
\biggr\}c^2 \, .
</math>
</math>
   </td>
   </td>
</tr>
</tr>
</table>
</table>
 +
This gives us three equations ''vs.'' seven unknowns.
-
===The Six Off-Diagonal Elements===
+
===Off-Diagonal Elements===
Notice that the off-diagonal components of both <math>~I_{ij}</math> and <math>~\mathfrak{W}_{ij}</math> are zero.  Hence, the equilibrium expression that is dictated by each off-diagonal component of the 2<sup>nd</sup>-order TVE is,
Notice that the off-diagonal components of both <math>~I_{ij}</math> and <math>~\mathfrak{W}_{ij}</math> are zero.  Hence, the equilibrium expression that is dictated by each off-diagonal component of the 2<sup>nd</sup>-order TVE is,
Line 338: Line 994:
   <td align="left">
   <td align="left">
<math>~
<math>~
-
2 \mathfrak{T}_{ij} - \Omega_i\Omega_k I_{kj} + 2\epsilon_{ilm}\Omega_m \int_V \rho u_lx_j dx
+
2 \mathfrak{T}_{ij} - \Omega_i\Omega_k I_{kj} + 2\epsilon_{ilm}\Omega_m \int_V \rho u_lx_j d^3x
\, .
\, .
</math>
</math>
Line 357: Line 1,013:
   <td align="left">
   <td align="left">
<math>~
<math>~
-
2 \mathfrak{T}_{23} - \Omega_2\Omega_3 I_{33} + 2\Omega_1 \cancelto{0}{\int_V \rho u_3x_3 dx}
+
2 \mathfrak{T}_{23} - \Omega_2\Omega_3 I_{33} + 2\Omega_1 \cancelto{0}{\int_V \rho u_3x_3 d^3x}
-
- 2\Omega_3 \int_V \rho u_1x_3 dx \, ,
+
- 2\Omega_3 \int_V \rho u_1x_3 d^3x \, ,
</math>
</math>
   </td>
   </td>
Line 376: Line 1,032:
   <td align="left">
   <td align="left">
<math>~
<math>~
-
2 \mathfrak{T}_{32} - \Omega_3 \Omega_2 I_{22} + 2\Omega_2 \int_V \rho u_1x_2 dx
+
2 \mathfrak{T}_{32} - \Omega_3 \Omega_2 I_{22} + 2\Omega_2 \int_V \rho u_1x_2 d^3x
-
- 2\Omega_1 \cancelto{0}{\int_V \rho u_2 x_2 dx}
+
- 2\Omega_1 \cancelto{0}{\int_V \rho u_2 x_2 d^3x}
\, .
\, .
</math>
</math>
Line 391: Line 1,047:
<tr>
<tr>
   <td align="right">
   <td align="right">
-
<math>~\int_V \rho u_i x_j dx</math>
+
<math>~\int_V \rho u_i x_j d^3x</math>
   </td>
   </td>
   <td align="center">
   <td align="center">
Line 426: Line 1,082:
</td></tr></table>
</td></tr></table>
 +
Our first off-diagonal element is, then,
 +
 +
<table border="0" cellpadding="5" align="center">
 +
<tr>
 +
  <td align="right">
 +
<math>~0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
2 \mathfrak{T}_{23} - \Omega_2\Omega_3 I_{33}
 +
- 2\Omega_3 \rho \int_V u_1 z d^3x
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
- ~
 +
\biggl[ \frac{b^2}{b^2+a^2}\biggr]  \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 \zeta_3 a^2
 +
- \Omega_2\Omega_3 c^2
 +
- 2 \biggl[ \frac{a^2}{a^2+c^2}\biggr]\Omega_3 \zeta_2 c^2
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\biggl\{
 +
\Omega_2\Omega_3 
 +
+ \biggl[ \frac{\zeta_2 a^2}{a^2 + c^2 }\biggr] \biggl[ 2\Omega_3 + \frac{\zeta_3 b^2}{b^2+a^2}\biggr]   
 +
\biggr\} c^2
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\biggl\{
 +
 +
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{a^2}{a^2 + c^2 }\biggr] \biggl[ 2 + \frac{\zeta_3}{\Omega_3}\biggl( \frac{b^2}{b^2+a^2}\biggr) \biggr]   
 +
\biggr\} \Omega_2\Omega_3c^2 \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 +
The second is,
 +
 +
<table border="0" cellpadding="5" align="center">
 +
<tr>
 +
  <td align="right">
 +
<math>~0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
2 \mathfrak{T}_{32} - \Omega_3 \Omega_2 I_{22} + 2\Omega_2 \rho \int_V u_1 y d^3x
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
- ~
 +
\biggl[ \frac{b^2}{b^2+a^2}\biggr]  \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 \zeta_3  a^2
 +
- \Omega_3 \Omega_2 b^2
 +
- 2  \biggl[ \frac{a^2}{a^2 + b^2}\biggr]\Omega_2 \zeta_3 b^2
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\biggl\{
 +
\Omega_2 \Omega_3 
 +
+ \biggl[ \frac{\zeta_3 a^2}{a^2+b^2}\biggr]  \biggl[2\Omega_2 +  \frac{\zeta_2 c^2}{c^2 + a^2}\biggr] 
 +
\biggr\} b^2
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\biggl\{
 +
 +
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{a^2}{a^2+b^2}\biggr]  \biggl[2 +  \frac{\zeta_2}{\Omega_2} \biggl( \frac{c^2}{c^2 + a^2} \biggr) \biggr] 
 +
\biggr\} \Omega_2 \Omega_3b^2 \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
===How Solution is Obtained ===
Adding this pair of governing expressions we obtain,
Adding this pair of governing expressions we obtain,
   
   
Line 502: Line 1,293:
=Various Degrees of Simplification=
=Various Degrees of Simplification=
 +
 +
==Riemann Ellipsoids of Types I, II, &amp; III==
 +
In this, most general, case, the two vectors <math>~\vec{\Omega}</math> and <math>~\vec\zeta</math> are not parallel to any of the principal axes of the ellipsoid, and they are not aligned with each other, but they both lie in the <math>~y-z</math>-plane &#8212; that is to say, <math>~(\Omega_1, \zeta_1) = (0, 0)</math>.  For a given specified density <math>~(\rho)</math> and choice of the three semi-axes <math>~(a_1, a_2, a_3) \leftrightarrow (a, b, c)</math>, all five of the expressions displayed in our above [[#SummaryTable|''Summary Table'']] must be used in order to determine the equilibrium configuration's associated values of the five unknowns:  <math>~\Pi, (\Omega_2, \zeta_2), (\Omega_3, \zeta_3)</math>.  Here we show how these five unknowns can be derived from the five constraint equations, closely following the analysis that is presented in &sect;47 (pp. 129 - 132) of [ [[User:Tohline/Appendix/References#EFE|EFE]] ].
 +
 +
===Constraints Due to Off-Diagonal Elements===
 +
We begin by subtracting the constraint equation provided by the first off-diagonal element <math>~(i, j) = (2, 3)</math> from the constraint equation provided by the second off-diagonal element <math>~(i, j) = (3, 2) </math>.  This gives,
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\biggl\{
 +
 +
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{a^2}{a^2 + c^2 }\biggr] \biggl[ 2 + \frac{\zeta_3}{\Omega_3}\biggl( \frac{b^2}{b^2+a^2}\biggr) \biggr]   
 +
\biggr\} \Omega_2\Omega_3c^2
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\biggl\{
 +
 +
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{a^2}{a^2+b^2}\biggr]  \biggl[2 +  \frac{\zeta_2}{\Omega_2} \biggl( \frac{c^2}{c^2 + a^2} \biggr) \biggr] 
 +
\biggr\} \Omega_2 \Omega_3b^2
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\Rightarrow ~~~
 +
c^2 
 +
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2 a^2 c^2}{a^2 + c^2 }\biggr] \biggl[ 1 + \frac{\zeta_3}{2 \Omega_3}\biggl( \frac{b^2}{b^2+a^2}\biggr) \biggr]     
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
b^2
 +
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{2 a^2 b^2}{a^2+b^2}\biggr]  \biggl[1 +  \frac{\zeta_2}{2\Omega_2} \biggl( \frac{c^2}{c^2 + a^2} \biggr) \biggr] 
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\Rightarrow ~~~
 +
c^2 
 +
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2 a^2 c^2}{a^2 + c^2 }\biggr]     
 +
+ \frac{\zeta_2}{\Omega_2} \cdot \frac{\zeta_3}{\Omega_3} \biggl[ \frac{a^2 c^2}{a^2 + c^2 }\biggr] \biggl[ \frac{b^2}{b^2+a^2} \biggr]     
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
b^2
 +
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{2 a^2 b^2}{a^2+b^2}\biggr]   
 +
+ \frac{\zeta_3}{\Omega_3} \cdot \frac{\zeta_2}{\Omega_2} \biggl[ \frac{a^2 b^2}{a^2+b^2}\biggr]  \biggl[ \frac{c^2}{c^2 + a^2} \biggr] 
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\Rightarrow ~~~
 +
c^2  + \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2 a^2 c^2}{a^2 + c^2 }\biggr]     
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
b^2
 +
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{2 a^2 b^2}{a^2+b^2}\biggr]    \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 7, &sect;47, Eq. (11)</font> ]</td></tr>
 +
</table>
 +
 +
Adding the two instead gives,
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~
 +
0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl\{
 +
 +
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{a^2}{a^2 + c^2 }\biggr] \biggl[ 2 + \frac{\zeta_3}{\Omega_3}\biggl( \frac{b^2}{b^2+a^2}\biggr) \biggr]   
 +
\biggr\} \Omega_2\Omega_3c^2
 +
+
 +
\biggl\{
 +
 +
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{a^2}{a^2+b^2}\biggr]  \biggl[2 +  \frac{\zeta_2}{\Omega_2} \biggl( \frac{c^2}{c^2 + a^2} \biggr) \biggr] 
 +
\biggr\} \Omega_2 \Omega_3b^2
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
b^2 + c^2
 +
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{a^2 c^2}{a^2 + c^2 }\biggr] \biggl[ 2 + \frac{\zeta_3}{\Omega_3}\biggl( \frac{b^2}{b^2+a^2}\biggr) \biggr]   
 +
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{a^2 b^2}{a^2+b^2}\biggr]  \biggl[2 +  \frac{\zeta_2}{\Omega_2} \biggl( \frac{c^2}{c^2 + a^2} \biggr) \biggr] 
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
b^2 + c^2
 +
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2a^2 c^2}{a^2 + c^2 }\biggr]   
 +
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{2a^2 b^2}{a^2+b^2}\biggr]   
 +
+ \frac{\zeta_2}{\Omega_2} \cdot  \frac{\zeta_3}{\Omega_3} \biggl[ \frac{2a^2 b^2 c^2}{(a^2 + c^2)( b^2+a^2 ) }\biggr]      \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 7, &sect;47, Eq. (10)</font> ]</td></tr>
 +
</table>
 +
 +
The first of these relations cleanly gives an expression for the frequency ratio, <math>~\zeta_3/\Omega_3</math>, in terms of the ''other'' frequency ratio, <math>~\zeta_2/\Omega_2</math>.  This allows us to rewrite the second relation in terms of the ratio, <math>~\zeta_2/\Omega_2</math>, alone.  We obtain,
 +
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
b^2 + c^2
 +
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2a^2 c^2}{a^2 + c^2 }\biggr]   
 +
+ \biggl\{ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{2a^2 b^2}{a^2+b^2}\biggr] \biggr\}
 +
+ \frac{\zeta_2}{\Omega_2} \biggl[\frac{c^2 }{(a^2 + c^2) }  \biggr]  \cdot  \biggl\{ \frac{\zeta_3}{\Omega_3} \biggl[ \frac{2a^2 b^2 }{( b^2+a^2 ) }\biggr] \biggr\}
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
b^2 + c^2
 +
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2a^2 c^2}{a^2 + c^2 }\biggr]   
 +
+ \biggl\{ c^2 - b^2  + \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2 a^2 c^2}{a^2 + c^2 }\biggr] \biggr\}
 +
+ \frac{\zeta_2}{\Omega_2} \biggl[\frac{c^2 }{(a^2 + c^2) }  \biggr]  \cdot  \biggl\{ c^2 - b^2  + \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2 a^2 c^2}{a^2 + c^2 }\biggr] \biggr\}
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
2c^2
 +
+ \frac{\zeta_2}{\Omega_2} \biggl[\frac{c^2 }{a^2 + c^2 }  \biggr] (4a^2 + c^2 - b^2  )
 +
+  \biggl\{ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{c^2}{a^2 + c^2 }\biggr] \biggr\}^22a^2
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 +
<table border="1" align="center" cellpadding="10" width="80%"><tr><td align="left">
 +
ASIDE:  &nbsp; Alternatively, given that,
 +
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~
 +
\frac{\zeta_2}{\Omega_2}\biggl[ \frac{c^2}{a^2 + c^2 }\biggr] 
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\frac{1}{2a^2}\biggl[ b^2 - c^2+ \frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr) \biggr]
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
the quadratic equation that governs the value of the frequency ratio, <math>~\zeta_3/\Omega_3</math> is &hellip;
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
4 a^2 c^2
 +
+ \biggl[ b^2 - c^2+ \frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr) \biggr]  (4a^2 + c^2 - b^2  )
 +
+  \biggl[ b^2 - c^2+ \frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr) \biggr]^2
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
4 a^2 c^2
 +
+ \biggl[ \frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr) \biggr]  (4a^2 + c^2 - b^2  )
 +
+ ( b^2 - c^2)  (4a^2 + c^2 - b^2  )
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
&nbsp;
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
+  (b^2 - c^2)^2 + 2(b^2 - c^2) \biggl[\frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr)\biggr]
 +
+ \biggl[\frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr)\biggr]^2
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
4 a^2 c^2
 +
+ ( b^2 - c^2)  (4a^2 + c^2 - b^2  )
 +
+  (b^2 - c^2)^2
 +
+ \biggl[ \frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr) \biggr]
 +
\biggl[ (4a^2 + c^2 - b^2  )+ 2(b^2 - c^2) \biggr]
 +
+ \biggl[\frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr)\biggr]^2
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[\frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr)\biggr]^2
 +
+ \biggl[ \frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr) \biggr]
 +
(4a^2 + b^2 - c^2 )
 +
+ 4 a^2 b^2
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\Rightarrow~~~ 0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \biggl(\frac{\zeta_3}{\Omega_3} \biggr)^2 \frac{a^2 b^2}{(a^2+b^2)^2}\biggr]
 +
+ \frac{1}{2}\biggl[ \frac{\zeta_3}{\Omega_3}\biggl( \frac{1}{a^2+b^2}\biggr) \biggr]
 +
(4a^2 + b^2 - c^2 )
 +
+ 1 \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 +
Now, in our discussion of Riemann S-Type ellipsoids, there is also a quadratic equation that governs the equilibrium frequency ratio, <math>~f \equiv \zeta_3/\Omega_3</math>.  It is, specifically,
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \frac{a^2 b^2}{(a^2 + b^2)^2} \biggr] f^2
 +
+ \biggl[ \frac{2a^2 b^2 B_{12}}{c^2 A_3 - a^2 b^2 A_{12}} \biggr]\frac{f}{a^2 + b^2} + 1 \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">&sect;48, Eq. (35)</font> ]</td></tr>
 +
</table>
 +
Notice that the first and third terms of this quadratic equation exactly match the first and third terms of the quadratic equation, which we have just derived, that governs the same frequency ratio in Riemann ellipsoids of Types I, II &amp; III.  Does the second term match?  That is, is the coefficient of the linear term the same in both quadratic relations?  Well, &hellip;
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~ \frac{2a^2 b^2 B_{12}}{c^2 A_3 - a^2 b^2 A_{12}} </math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~2a^2 b^2 \biggl[ c^2 A_3 + a^2 b^2 \biggl( \frac{A_1 - A_2}{a^2-b^2} \biggr)\biggr]^{-1} \biggl[A_2 + a^2\biggl( \frac{A_1 - A_2}{a^2-b^2} \biggr)\biggr]
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~2a^2 b^2 \biggl[ c^2 A_3(a^2 - b^2) + a^2 b^2 (A_1 - A_2) \biggr]^{-1} \biggl[a^2 A_1  - b^2 A_2\biggr] \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 +
Even appreciating that we can make the substitution, <math>~A_3 = (2 - A_1 - A_2)</math>, I don't see any way that this coefficient expression can be manipulated to match the associated coefficient in the other expression, namely, <math>~(4a^2 + b^2 - c^2)/2</math>.
 +
 +
</td></tr></table>
 +
 +
 +
This is a quadratic equation whose solution gives,
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~4a^2 \cdot \frac{\zeta_2}{\Omega_2} \biggl[\frac{c^2 }{a^2 + c^2 }  \biggr] </math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
- (4a^2 + c^2 - b^2  ) \pm \biggl[ (4a^2 + c^2 - b^2  )^2 - 16a^2 c^2 \biggr]^{1 / 2} \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 +
For the other frequency ratio we therefore find,
 +
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~
 +
2\biggl\{ b^2 -c^2
 +
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{2 a^2 b^2}{a^2+b^2}\biggr]  \biggr\}
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
2 \cdot \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2 a^2 c^2}{a^2 + c^2 }\biggr]     
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
- (4a^2 + c^2 - b^2  ) \pm \biggl[ (4a^2 + c^2 - b^2  )^2 - 16a^2 c^2 \biggr]^{1 / 2}
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~ \Rightarrow ~~~
 +
4a^2 \cdot \frac{\zeta_3}{\Omega_3}\biggl[ \frac{b^2}{a^2+b^2}\biggr]
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
- (4a^2  + b^2 -c^2)  \pm \biggl[ (4a^2 + c^2 - b^2  )^2 - 16a^2 c^2 \biggr]^{1 / 2}
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
<span id="OffDiagonal">&nbsp;</span>
 +
<table border="1" width="80%" align="center" cellpadding="10"><tr><td align="left">
 +
<div align="center">'''SUMMARY: &nbsp; Riemann Ellipsoids of Types I, II, &amp; III'''</div>
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\beta \equiv~ -~\frac{\zeta_2}{\Omega_2} \biggl[\frac{c^2 }{a^2 + c^2 }  \biggr] </math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\frac{1}{4a^2}\biggl\{ (4a^2 -b^2 + c^2  ) \mp \biggl[ (4a^2 + c^2 - b^2  )^2 - 16a^2 c^2 \biggr]^{1 / 2} \biggr\} \, ;
 +
</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 7, &sect;47, Eq. (16)</font> ]</td></tr>
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~
 +
\gamma \equiv~-~\frac{\zeta_3}{\Omega_3}\biggl[ \frac{b^2}{a^2+b^2}\biggr]
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\frac{1}{4a^2}\biggl\{ (4a^2  + b^2 -c^2)  \mp \biggl[ (4a^2 + c^2 - b^2  )^2 - 16a^2 c^2 \biggr]^{1 / 2} \biggr\} \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 7, &sect;47, Eq. (17)</font> ]</td></tr>
 +
</table>
 +
 +
As is emphasized in [[User:Tohline/Appendix/References#EFE|EFE]] (Chapter 7, &sect;47, p. 131) "<font color="darkgreen">&hellip; the signs in front of the radicals, in the two expressions, go together.</font>  Furthermore, "<font color="darkgreen">the two roots &hellip; correspond to the fact that, consistent with Dedekind's theorem, two states of internal motions are compatible with the same external figure.</font>"
 +
 +
----
 +
 +
As has also been pointed out in [[User:Tohline/Appendix/References#EFE|EFE]] (Chapter 7, &sect;51, p. 158), from the steps that have led to the development and solution of the above pair of quadratic equations we can demonstrate that the following relations also hold:
 +
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\beta^2 - 2\beta + \frac{c^2}{a^2} = \biggl[ \frac{c^2 - b^2}{2a^2}\biggr]\beta \, ,</math>
 +
  </td>
 +
  <td align="center">
 +
&nbsp; &nbsp; &nbsp; &nbsp;
 +
  </td>
 +
  <td align="left">
 +
<math>~\gamma^2 -2\gamma + \frac{b^2}{a^2} = \biggl[ \frac{b^2 - c^2}{2a^2} \biggr]\gamma</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~1 - 2\beta + \biggl(\frac{a^2}{c^2}\biggr)\beta^2 </math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\biggl[ \frac{4a^2 - b^2 - 3c^2}{2c^2}\biggr]\beta \, ,</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~1 - 2\gamma + \biggl(\frac{a^2}{b^2}\biggr)\gamma^2 </math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\biggl[ \frac{4a^2 - c^2 - 3b^2}{2b^2}\biggr]\gamma \, .</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 7, &sect;51, Eqs. (161) - (163)</font> ]</td></tr>
 +
</table>
 +
 +
</td></tr></table>
 +
 +
===Constraints Due to Diagonal Elements===
 +
 +
Next, to simplify manipulations, let's replace the frequency ratios by these newly defined &#8212; and ''known'' &#8212; parameters, <math>~\beta</math> and <math>~\gamma</math>, in the three diagonal-element expressions that are written out in our above [[#SummaryTable|Summary Table]].
 +
 +
 +
<table border="1" align="center" cellpadding="5">
 +
<tr>
 +
  <td align="center" colspan="2">Indices</td>
 +
  <td align="center" rowspan="2">Rewritten Diagonal-Element Expressions</td>
 +
</tr>
 +
<tr>
 +
  <td align="center" width="5%"><math>~i</math></td>
 +
  <td align="center" width="5%"><math>~j</math></td>
 +
</tr>
 +
<tr>
 +
  <td align="center"><math>~1</math></td>
 +
  <td align="center"><math>~1</math></td>
 +
  <td align="left">
 +
 +
<table align="left" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~\biggl[ \frac{3\cdot 5}{2^2\pi a b c\rho} \biggr] \Pi</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
-~\biggl\{
 +
( \Omega_2^2 + \Omega_3^2) 
 +
+ 2  \biggl[ \frac{b^2}{b^2+a^2}\biggr] \Omega_3 \biggl[ - \frac{\Omega_3\gamma (a^2 + b^2)}{b^2} \biggr]
 +
+ 2  \biggl[ \frac{c^2}{c^2 + a^2}\biggr]\Omega_2 \biggl[ -  \frac{\Omega_2 \beta( a^2 + c^2)}{c^2} \biggr]
 +
~-~(2\pi G\rho) A_1
 +
\biggr\} a^2
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
&nbsp;
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
- \biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \biggl[ - \frac{\Omega_3\gamma (a^2 + b^2)}{b^2} \biggr]^2 b^2
 +
- \biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \biggl[ -  \frac{\Omega_2 \beta( a^2 + c^2)}{c^2} \biggr]^2  c^2 
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl\{
 +
- \Omega_2^2 - \Omega_3^2 
 +
+ 2 \Omega_3^2 \gamma
 +
+ 2  \Omega_2^2 \beta
 +
~+~(2\pi G\rho) A_1
 +
\biggr\} a^2
 +
- \biggl( \frac{a^4}{b^2}\biggr) \Omega_3^2\gamma^2 
 +
- \biggl( \frac{a^4}{c^2}\biggr) \Omega_2^2 \beta^2 
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl\{ \Omega_2^2 \biggl[2  \beta - 1 - \biggl( \frac{a^2}{c^2}\biggr)  \beta^2 \biggr]
 +
+ \Omega_3^2 \biggl[ 2  \gamma - 1  - \biggl( \frac{a^2}{b^2}\biggr)\gamma^2  \biggr]
 +
~+~(2\pi G\rho) A_1
 +
\biggr\}a^2 
 +
</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 7, &sect;51, Eq. (158)</font> ]</td></tr>
 +
</table>
 +
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="center"><math>~2</math></td>
 +
  <td align="center"><math>~2</math></td>
 +
  <td align="left">
 +
 +
<table align="left" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~\biggl[ \frac{3\cdot 5}{2^2\pi a b c \rho} \biggr]\Pi</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
-~ \biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \biggl[ - \frac{\Omega_3\gamma (a^2 + b^2)}{b^2} \biggr]^2 a^2
 +
- \biggl\{
 +
\Omega_3^2 
 +
+ 2 \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \Omega_3 \biggl[ - \frac{\Omega_3\gamma (a^2 + b^2)}{b^2} \biggr] 
 +
~-~( 2\pi G \rho) A_2
 +
\biggr\}b^2
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
-~\Omega_3^2 \gamma^2 a^2
 +
- \Omega_3^2 b^2 
 +
+ 2 a^2 \Omega_3^2 \gamma 
 +
~+~( 2\pi G \rho) b^2A_2
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
-~a^2 \Omega_3^2 \biggl[\gamma^2 - 2\gamma 
 +
+ \biggl( \frac{b^2}{a^2}\biggr) \biggr] 
 +
~+~( 2\pi G \rho) b^2A_2
 +
</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 7, &sect;51, Eq. (159)</font> ]</td></tr>
 +
</table>
 +
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="center"><math>~3</math></td>
 +
  <td align="center"><math>~3</math></td>
 +
  <td align="left">
 +
 +
<table align="left" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~\biggl[ \frac{3\cdot 5}{2^2\pi abc\rho} \biggr]\Pi</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
- \biggl[ \frac{c^2}{c^2 + a^2}\biggr]^2 \biggl[ -  \frac{\Omega_2 \beta( a^2 + c^2)}{c^2} \biggr]^2  a^2
 +
- \biggl\{
 +
\Omega_2^2  + 2 \biggl[ \frac{a^2}{a^2+c^2}\biggr]\Omega_2 \biggl[ -  \frac{\Omega_2 \beta( a^2 + c^2)}{c^2} \biggr]
 +
- (2\pi G \rho)A_3
 +
\biggr\}c^2
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
-  \Omega_2^2 \beta^2 a^2
 +
-\Omega_2^2c^2  + 2 a^2\Omega_2^2 \beta 
 +
+ (2\pi G \rho)c^2 A_3 
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~-~a^2\Omega_2^2\biggl[
 +
\beta^2 - 2 \beta
 +
+ \biggl( \frac{c^2}{a^2}\biggr)    \biggr]
 +
+ (2\pi G \rho)c^2 A_3 
 +
</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 7, &sect;51, Eq. (160)</font> ]</td></tr>
 +
</table>
 +
 +
  </td>
 +
</tr>
 +
</table>
 +
 +
 +
Using the <math>~(i, j) = (3, 3)</math> element to preplace <math>~\Pi</math> in the other two expressions, we obtain,
 +
 +
<table align="center" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~0
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\Omega_2^2\biggl[
 +
\beta^2 - 2 \beta
 +
+ \biggl( \frac{c^2}{a^2}\biggr)    \biggr]
 +
+
 +
\Omega_2^2 \biggl[2  \beta - 1 - \biggl( \frac{a^2}{c^2}\biggr)  \beta^2 \biggr]
 +
+ \Omega_3^2 \biggl[ 2  \gamma - 1  - \biggl( \frac{a^2}{b^2}\biggr)\gamma^2  \biggr]
 +
~+~2\pi G\rho \biggl[ A_1 -  \biggl(\frac{c^2}{a^2}\biggr)A_3 \biggr] \, ;
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 +
and,
 +
 +
<table align="center" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~\Omega_2^2\biggl[
 +
\beta^2 - 2 \beta
 +
+ \biggl( \frac{c^2}{a^2}\biggr)    \biggr]
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\Omega_3^2 \biggl[\gamma^2 - 2\gamma 
 +
+ \biggl( \frac{b^2}{a^2}\biggr) \biggr] 
 +
~+~2\pi G \rho \biggl[\biggl( \frac{c^2}{a^2}\biggr) A_3 -  \biggl( \frac{b^2}{a^2} \biggr)A_2 \biggr] \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 +
Inserting the [[#OffDiagonal|various relations highlighted above]], these two expressions may be rewritten as,
 +
 +
<table align="center" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~0
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\Omega_2^2
 +
\biggl[ \frac{c^2 - b^2}{2a^2}\biggr]\beta
 +
~-~\Omega_2^2 \biggl[ \frac{4a^2 - b^2 - 3c^2}{2c^2}\biggr]\beta
 +
~-~\Omega_3^2 \biggl[ \frac{4a^2 - c^2 - 3b^2}{2b^2}\biggr]\gamma
 +
~+~2\pi G\rho \biggl[ A_1 -  \biggl(\frac{c^2}{a^2}\biggr)A_3 \biggr]
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\Omega_2^2\beta
 +
\biggl[ \frac{c^2(c^2 - b^2) + a^2 (b^2 + 3c^2 - 4a^2)}{2a^2c^2}
 +
\biggr]
 +
~-~\Omega_3^2 \gamma \biggl[ \frac{4a^2 - c^2 - 3b^2}{2b^2}\biggr]
 +
~+~2\pi G\rho \biggl[ A_1 -  \biggl(\frac{c^2}{a^2}\biggr)A_3 \biggr] \, ;
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 +
<span id="Temporary">and,</span>
 +
 +
<table align="center" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~\Omega_2^2
 +
\biggl[ \frac{c^2 - b^2}{2a^2}\biggr]\beta</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\Omega_3^2
 +
\biggl[ \frac{b^2 - c^2}{2a^2} \biggr]\gamma~+~2\pi G \rho \biggl[\biggl( \frac{c^2}{a^2}\biggr) A_3 -  \biggl( \frac{b^2}{a^2} \biggr)A_2 \biggr]
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\Rightarrow ~~~ \Omega_2^2 \beta
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
~-~\Omega_3^2 \gamma
 +
~+~4\pi G \rho \biggl[ \frac{ c^2 A_3 -  b^2 A_2}{c^2 - b^2} \biggr]
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\Rightarrow ~~~ -~\Omega_3^2 \gamma
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\Omega_2^2 \beta~-~4\pi G \rho \biggl[ \frac{ c^2 A_3 -  b^2 A_2}{c^2 - b^2} \biggr] \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
Together, then,
 +
 +
<table align="center" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~0
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\Omega_2^2\beta
 +
\biggl[ \frac{c^2(c^2 - b^2) + a^2 (b^2 + 3c^2 - 4a^2)}{2a^2c^2}
 +
\biggr]
 +
~+~2\pi G\rho \biggl[ A_1 -  \biggl(\frac{c^2}{a^2}\biggr)A_3 \biggr]
 +
~+~\biggl[ \frac{4a^2 - c^2 - 3b^2}{2b^2}\biggr]\biggl\{
 +
\Omega_2^2 \beta~-~4\pi G \rho \biggl[ \frac{ c^2 A_3 -  b^2 A_2}{c^2 - b^2} \biggr]
 +
\biggr\}
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\Omega_2^2\beta
 +
\biggl[ \frac{c^2(c^2 - b^2) + a^2 (b^2 + 3c^2 - 4a^2)}{2a^2c^2}
 +
~+~\frac{4a^2 - c^2 - 3b^2}{2b^2}\biggr]
 +
~+~2\pi G\rho \biggl[ \frac{a^2A_1 - c^2 A_3}{a^2} \biggr]
 +
~-~2\pi G \rho \biggl[ \frac{4a^2 - c^2 - 3b^2}{b^2}\biggr]
 +
\biggl[ \frac{ c^2 A_3 -  b^2 A_2}{c^2 - b^2} \biggr]
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\Omega_2^2\beta
 +
\biggl\{ \frac{b^2[ c^2(c^2 - b^2) + a^2 (b^2 + 3c^2 - 4a^2)] + (4a^2 - c^2 - 3b^2)a^2 c^2}{2a^2 b^2 c^2}
 +
\biggr\}
 +
~+~2\pi G\rho \biggl\{
 +
\biggl[ \frac{a^2A_1 - c^2 A_3}{a^2} \biggr]
 +
~-~\biggl[ \frac{4a^2 - c^2 - 3b^2}{b^2}\biggr]
 +
\biggl[ \frac{ c^2 A_3 -  b^2 A_2}{c^2 - b^2} \biggr]
 +
\biggr\}
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\Omega_2^2\beta
 +
\biggl\{ \frac{b^2 c^2(c^2 - b^2) + a^2 b^2(c^2 - b^2 ) + ( c^2 - b^2)a^2 c^2 + a^2 (4a^2 -2b^2 - 2c^2 )(c^2 - b^2 ) }{2a^2 b^2 c^2}
 +
\biggr\}
 +
~+~2\pi G\rho
 +
\biggl[ \frac{b^2(a^2A_1 - c^2 A_3) + a^2(3b^2-4a^2 + c^2)B_{23} }{a^2b^2} \biggr]
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\Omega_2^2\beta \biggl[ \frac{c^2 - b^2}{c^2} \biggr]
 +
\biggl[ \frac{ 4a^4 - a^2 (b^2 + c^2) + b^2 c^2  }{2a^2 b^2 }
 +
\biggr]
 +
~+~2\pi G\rho
 +
\biggl[ \frac{a^2(3b^2-4a^2 + c^2)B_{23} + b^2(a^2A_1 - c^2 A_3)  }{a^2b^2} \biggr] \, ,
 +
</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 7, &sect;51, Eq. (170)</font> ]</td></tr>
 +
</table>
 +
where,
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~B_{23}</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\biggl[ \frac{A_2 b^2 - A_3 c^2}{b^2 - c^2} \biggr] \, .</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 3, &sect;21, Eqs. (105) &amp; (107)</font> ]</td></tr>
 +
</table>
 +
 +
Similarly, given that ([[#Temporary|see just above]]),
 +
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\Omega_2^2 \beta \biggl[ \frac{c^2 - b^2}{c^2} \biggr]
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
-~\Omega_3^2 \gamma \biggl[ \frac{c^2 - b^2}{c^2} \biggr]
 +
~+~4\pi G \rho \biggl[ \frac{ c^2 A_3 -  b^2 A_2}{c^2 } \biggr]
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
-~\Omega_3^2 \gamma \biggl[ \frac{c^2 - b^2}{c^2} \biggr]
 +
~+~4\pi G \rho \biggl[ \frac{ (c^2 -  b^2)B_{23} }{c^2 } \biggr] \, ,
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
we have,
 +
 +
<table border="0" cellpadding="5" align="center">
 +
<tr>
 +
  <td align="right">
 +
<math>~0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl\{
 +
-~\Omega_3^2 \gamma \biggl[ \frac{c^2 - b^2}{c^2} \biggr]
 +
~+~4\pi G \rho \biggl[ \frac{ (c^2 -  b^2)B_{23} }{c^2 } \biggr]
 +
\biggr\}
 +
\biggl[ \frac{ 4a^4 - a^2 (b^2 + c^2) + b^2 c^2  }{2a^2 b^2 }
 +
\biggr]
 +
~+~2\pi G\rho
 +
\biggl[ \frac{a^2(3b^2-4a^2 + c^2)B_{23} + b^2(a^2A_1 - c^2 A_3)  }{a^2b^2} \biggr]
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
-~\Omega_3^2 \gamma \biggl[ \frac{c^2 - b^2}{b^2} \biggr]
 +
\biggl[ \frac{ 4a^4 - a^2 (b^2 + c^2) + b^2 c^2  }{2a^2 c^2 }
 +
\biggr]
 +
~+~2\pi G \rho \biggl\{
 +
\biggl[ \frac{ [4a^4 - a^2 (b^2 + c^2) + b^2 c^2 ](c^2 -  b^2)B_{23}  }{a^2 b^2 c^2 }
 +
\biggr]
 +
~+~
 +
\biggl[ \frac{a^2c^2 (3b^2-4a^2 + c^2)B_{23} + b^2c^2(a^2A_1 - c^2 A_3)  }{a^2b^2 c^2} \biggr]
 +
\biggr\}
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
-~\Omega_3^2 \gamma \biggl[ \frac{c^2 - b^2}{b^2} \biggr]
 +
\biggl[ \frac{ 4a^4 - a^2 (b^2 + c^2) + b^2 c^2  }{2a^2 c^2 }
 +
\biggr]
 +
~+~2\pi G \rho
 +
\biggl[ \frac{ a^2( b^2 + 3c^2 - 4a^2 ) B_{23} +c^2(a^2A_1 - b^2 A_2)  }{a^2 c^2 }
 +
\biggr] \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 7, &sect;51, Eq. (171)</font> ]</td></tr>
 +
</table>
 +
 +
Finally, looking back at the <math>~(i, j) = (3, 3)</math> constraint and recognizing that,
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~-~
 +
\Omega_2^2\beta (c^2 - b^2)
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
4\pi G\rho c^2
 +
\biggl[ \frac{a^2(3b^2-4a^2 + c^2)B_{23} + b^2(a^2A_1 - c^2 A_3)  }{ 4a^4 - a^2 (b^2 + c^2) + b^2 c^2  } \biggr] \, ,
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 +
we find,
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~2\biggl[ \frac{3\cdot 5}{2^2\pi abc\rho} \biggr]\Pi</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~-~2a^2\Omega_2^2\biggl[
 +
\beta^2 - 2 \beta
 +
+ \biggl( \frac{c^2}{a^2}\biggr)    \biggr]
 +
+ (4\pi G \rho)c^2 A_3 
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
(4\pi G \rho)c^2 A_3 
 +
-~
 +
(c^2 - b^2 )\Omega_2^2 \beta
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
(4\pi G \rho)c^2 A_3 
 +
+~
 +
4\pi G\rho c^2
 +
\biggl[ \frac{a^2(3b^2-4a^2 + c^2)B_{23} + b^2(a^2A_1 - c^2 A_3)  }{ 4a^4 - a^2 (b^2 + c^2) + b^2 c^2  } \biggr]
 +
</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
4\pi G \rho c^2 \biggl\{ A_3 
 +
+~
 +
\biggl[ \frac{a^2(3b^2-4a^2 + c^2)B_{23} + b^2(a^2A_1 - c^2 A_3)  }{ 4a^4 - a^2 (b^2 + c^2) + b^2 c^2  } \biggr]
 +
\biggr\} \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
==Riemann S-Type Ellipsoids==
==Riemann S-Type Ellipsoids==
-
Describe &hellip;
+
In this case, we assume that <math>~\vec{\Omega}</math> and <math>~\vec\zeta</math> are aligned with each other and, as well, are aligned with the <math>~z</math>-axis; that is to say, in addition to setting <math>~(\Omega_1, \zeta_1) = (0, 0)</math> we also set <math>~(\Omega_2, \zeta_2) = (0, 0)</math>.  So, there are only three unknowns &#8212; <math>~\Pi, (\Omega_3, \zeta_3)</math> &#8212; and they can be determined by ignoring off-axis expressions and simultaneously solving the ''diagonal element'' expressions  displayed in our above [[#SummaryTable|''Summary Table'']].  Furthermore, two of the three diagonal-element expressions can be simplified because we are setting <math>~(\Omega_2, \zeta_2) = (0, 0)</math>.  The three relevant equilibrium constraints are:
 +
 
 +
 
 +
<table border="1" align="center" cellpadding="5">
 +
<tr>
 +
  <td align="center" colspan="2">Indices</td>
 +
  <td align="center" rowspan="2">2<sup>nd</sup>-Order TVE Expressions that are Relevant to Riemann S-Type Ellipsoids</td>
 +
</tr>
 +
<tr>
 +
  <td align="center" width="5%"><math>~i</math></td>
 +
  <td align="center" width="5%"><math>~j</math></td>
 +
</tr>
 +
<tr>
 +
  <td align="center"><math>~1</math></td>
 +
  <td align="center"><math>~1</math></td>
 +
  <td align="left">
 +
 
 +
<table align="left" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \frac{3\cdot 5}{2^2\pi a b c\rho} \biggr] \Pi
 +
+\biggl\{
 +
\Omega_3^2
 +
+ 2  \biggl[ \frac{b^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3
 +
~-~(2\pi G\rho) A_1
 +
\biggr\} a^2
 +
+ \biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 b^2
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="center"><math>~2</math></td>
 +
  <td align="center"><math>~2</math></td>
 +
  <td align="left">
 +
 
 +
<table align="left" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \frac{3\cdot 5}{2^2\pi a b c \rho} \biggr]\Pi
 +
+ \biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \zeta_3^2 a^2
 +
+ \biggl\{
 +
\Omega_3^2 
 +
+ 2 \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3 
 +
~-~( 2\pi G \rho) A_2
 +
\biggr\}b^2
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="center"><math>~3</math></td>
 +
  <td align="center"><math>~3</math></td>
 +
  <td align="left">
 +
 
 +
<table align="left" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \frac{3\cdot 5}{2^2\pi abc\rho} \biggr]\Pi
 +
- (2\pi G \rho)A_3 c^2
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 
 +
  </td>
 +
</tr>
 +
</table>
 +
 
 +
 
 +
The <math>~(i, j) = (3, 3)</math> component expression immediately identifies the value of one of the unknowns, namely,
 +
<table border="0" cellpadding="5" align="center">
 +
 
 +
<tr>
 +
  <td align="right">
 +
<math>~\Pi</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl( \frac{2^3\pi^2}{3\cdot 5} \biggr) G \rho^2A_3 a b c^3 \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 
 +
From the remaining pair of diagonal-element expressions, we therefore have,
 +
 
 +
<table align="center" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~
 +
0
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
a^2 \Omega_3^2
 +
+ 2  \biggl[ \frac{b^2a^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3
 +
+ \biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 b^2
 +
~+~(2\pi G\rho)(A_3 c^2 - A_1  a^2 ) \, ,
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 
 +
and,
 +
<table align="center" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~
 +
0
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \zeta_3^2 a^2
 +
+
 +
b^2 \Omega_3^2 
 +
+ 2 \biggl[ \frac{a^2b^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3 
 +
~+~( 2\pi G \rho)(A_3 c^2 - A_2 b^2) \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
Multiplying the first of these two expressions through by <math>~b^2</math> and the second through by <math>~a^2</math>, then subtracting the second from the first gives,
 +
 
 +
<table align="center" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~0</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
b^2\biggl\{
 +
2  \biggl[ \frac{b^2a^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3
 +
+ \biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 b^2
 +
~+~(2\pi G\rho)(A_3 c^2 - A_1  a^2 ) \biggr\}
 +
</math>
 +
  </td>
 +
</tr>
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
&nbsp;
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
-~
 +
a^2\biggl\{
 +
\biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \zeta_3^2 a^2
 +
+ 2 \biggl[ \frac{a^2b^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3 
 +
~+~( 2\pi G \rho)(A_3 c^2 - A_2 b^2)
 +
\biggr\}
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl\{
 +
2  \biggl[ \frac{b^4 a^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3
 +
~+~(2\pi G\rho)(A_3 c^2 - A_1  a^2 )b^2 \biggr\}
 +
~-~
 +
\biggl\{
 +
2 \biggl[ \frac{a^4 b^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3 
 +
~+~( 2\pi G \rho)(A_3 c^2 - A_2 b^2) a^2
 +
\biggr\}
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
<math>~\Rightarrow ~~~ \biggl[ \frac{b^2 a^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3 
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\pi G\rho \biggl[ \frac{(A_3 c^2 - A_2 b^2) a^2 ~-~(A_3 c^2 - A_1  a^2 )b^2}{ b^2 - a^2} \biggr]
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\pi G\rho \biggl[ \frac{(A_1 - A_2)a^2b^2}{ b^2 - a^2} - A_3 c^2\biggr] \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 7, &sect;48, Eq. (30)</font> ]</td></tr>
 +
</table>
 +
Note that &#8212; as EFE has done and as we have recorded in a [[User:Tohline/ThreeDimensionalConfigurations/JacobiEllipsoids#Equilibrium_Conditions_for_Jacobi_Ellipsoids|related discussion]] &#8212; the first term on the right-hand-side of this last expression can be expressed more compactly in terms of the coefficient, <math>~A_{12}</math>.
 +
 
 +
Alternatively, dividing the first expression through by <math>~a^2</math> and the second by <math>~b^2</math>, then adding the pair of expressions gives,
 +
 
 +
<table align="center" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~
 +
0
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\Omega_3^2
 +
+ 2  \biggl[ \frac{b^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3
 +
+ \biggl[ \frac{a^2b^2}{(a^2 + b^2)^2}\biggr] \zeta_3^2
 +
~+~(2\pi G\rho)(A_3 c^2 - A_1  a^2 )\frac{1}{a^2}
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
&nbsp;
 +
  </td>
 +
  <td align="left">
 +
<math>~+~
 +
\biggl[ \frac{a^2 b^2}{(b^2+a^2)^2}\biggr] \zeta_3^2
 +
+
 +
\Omega_3^2 
 +
+ 2 \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3 
 +
~+~( 2\pi G \rho)(A_3 c^2 - A_2 b^2) \frac{1}{b^2}
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
2\Omega_3^2 + 2  \Omega_3 \zeta_3
 +
+ 2\biggl[ \frac{a^2b^2}{(a^2 + b^2)^2}\biggr] \zeta_3^2
 +
~+~2\pi G\rho \biggl[ \frac{A_3 c^2 - A_1  a^2 }{a^2} + \frac{A_3c^2 - A_2 b^2}{b^2}\biggr] \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 
 +
If we divide through by 2, then replace the product, <math>~\Omega_3\zeta_3</math>, in this expression by the relation derived immediately above, we have,
 +
 
 +
<table align="center" border=0 cellpadding="3">
 +
<tr>
 +
  <td align="right">
 +
<math>~
 +
\Omega_3^2 
 +
+ \biggl[ \frac{a^2b^2}{(a^2 + b^2)^2}\biggr] \zeta_3^2
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
~-~\pi G\rho \biggl[ \frac{b^2 (A_3 c^2 - A_1  a^2) + a^2(A_3c^2 - A_2 b^2 ) }{a^2b^2} \biggr]
 +
~-~ 
 +
\pi G\rho \biggl[ \frac{(A_1 - A_2)a^2b^2 - A_3 c^2(b^2 - a^2)}{ b^2 - a^2} \biggr]\biggl[ \frac{b^2+a^2}{b^2 a^2}\biggr]
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\frac{\pi G\rho}{ a^2b^2(a^2-b^2) }
 +
\biggl\{ [ b^2 (A_3 c^2 - A_1  a^2) + a^2(A_3c^2 - A_2 b^2 )](b^2-a^2)
 +
~+~ 
 +
[ (A_1 - A_2)a^2b^2 - A_3 c^2(b^2 - a^2) ](b^2+a^2)
 +
\biggr\}
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\frac{\pi G\rho}{ a^2b^2(a^2-b^2) }
 +
\biggl\{ [  - A_1  a^2 b^2 - A_2 a^2 b^2 ](b^2-a^2)
 +
~+~ 
 +
(A_1 - A_2)a^2b^2 (b^2+a^2)
 +
\biggr\}
 +
</math>
 +
  </td>
 +
</tr>
 +
 
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\frac{2\pi G\rho}{ (a^2-b^2) }
 +
\biggl[
 +
A_1  a^2
 +
- A_2  b^2
 +
\biggr] \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 7, &sect;48, Eq. (29)</font> ]</td></tr>
 +
</table>
 +
 
 +
<span id="fDefined">It has become customary to characterize each Riemann S-Type ellipsoid by the value of its equilibrium frequency ratio, </span>
 +
<table border="0" cellpadding="5" align="center">
 +
 
 +
<tr>
 +
  <td align="right">
 +
<math>~f</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~\equiv</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\frac{\zeta_3}{\Omega_3} \, ,</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
in which case the relevant pair of constraint equations becomes,
 +
 
 +
<table border="1" align="center" cellpadding="10" width="80%"><tr><td align="center">
 +
 
 +
<table border="0" cellpadding="5" align="center">
 +
<tr>
 +
  <td align="right">
 +
<math>~\biggl[ \frac{b^2 a^2}{b^2+a^2}\biggr] f \Omega_3^2 
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\pi G\rho \biggl[ \frac{(A_1 - A_2)a^2b^2}{ b^2 - a^2} - A_3 c^2\biggr] \, ;
 +
</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 7, &sect;48, Eq. (34)</font> ]</td></tr>
 +
</table>
 +
and,
 +
<table border="0" cellpadding="5" align="center">
 +
 
 +
<tr>
 +
  <td align="right">
 +
<math>~
 +
\Omega_3^2 \biggl\{1
 +
+ \biggl[ \frac{a^2b^2}{(a^2 + b^2)^2}\biggr] f^2 \biggr\}
 +
</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\frac{2\pi G\rho}{ (a^2-b^2) }
 +
\biggl[
 +
A_1  a^2
 +
- A_2  b^2
 +
\biggr] \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 7, &sect;48, Eq. (33)</font> ]</td></tr>
 +
</table>
 +
 
 +
</td></tr></table>
 +
 
 +
These two equations can straightforwardly be combined to generate a quadratic equation for the frequency ratio, <math>~f</math>.  Then, once the value of <math>~f</math> has been determined, either expression can be used to determine the corresponding equilibrium value for <math>~\Omega_3</math> in the unit of <math>~(\pi G \rho)^{1 / 2}</math>.  The fact that the value of <math>~f</math> is determined from the solution of  a quadratic equation underscores the realization that, for a given specification of the ellipsoidal geometry <math>~(a, b, c)</math>, if an equilibrium exists &#8212; ''i.e.,'' if the solution for <math>~f</math> is real rather than imaginary &#8212; then two equally valid, and usually different (''i.e.,'' non-degenerate), values of <math>~f</math> will be realized.  This means that two different underlying flows &#8212; one ''direct'' and the other ''adjoint'' &#8212; will sustain the shape of the ellipsoidal configuration, as viewed from a frame that is rotating about the <math>~z</math>-axis with frequency, <math>~\Omega_3</math>.
==Jacobi and Dedekind Ellipsoids==
==Jacobi and Dedekind Ellipsoids==
Line 1,041: Line 3,491:
   </td>
   </td>
</tr>
</tr>
-
</table>
 
-
and,
 
-
<table border="0" cellpadding="5" align="center">
 
<tr>
<tr>
Line 1,072: Line 3,519:
   </td>
   </td>
</tr>
</tr>
-
</table>
 
-
and,
 
-
<table border="0" cellpadding="5" align="center">
 
<tr>
<tr>
Line 1,103: Line 3,547:
   </td>
   </td>
</tr>
</tr>
-
</table>
 
-
and,
 
-
<table border="0" cellpadding="5" align="center">
 
<tr>
<tr>
Line 1,135: Line 3,576:
</tr>
</tr>
</table>
</table>
-
 
==Appendix E: &nbsp; Kinetic Energy Components ==
==Appendix E: &nbsp; Kinetic Energy Components ==
-
Looking first at the diagonal elements, we have,
+
===Diagonal Elements===
<table border="0" cellpadding="5" align="center">
<table border="0" cellpadding="5" align="center">
Line 1,176: Line 3,616:
<math>~\iiint  \biggl\{
<math>~\iiint  \biggl\{
\biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 y^2  
\biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 y^2  
-
- 2\biggl[ \frac{a^2}{a^2 + b^2}\biggr]   
+
- 2\cancelto{0}{\biggl[ \frac{a^2}{a^2 + b^2}\biggr]   
-
\biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 \zeta_3 yz  
+
\biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 \zeta_3} yz  
+ \biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \zeta_2^2 z^2  
+ \biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \zeta_2^2 z^2  
\biggr\} ~dx ~dy ~dz</math>
\biggr\} ~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 \iiint  y^2  ~dx ~dy ~dz
 +
+
 +
\biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \zeta_2^2\iiint z^2 ~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 \biggl[ \frac{I_{22}}{\rho} \biggr]
 +
+
 +
\biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \zeta_2^2 \biggl[ \frac{I_{33}}{\rho} \biggr] \, .</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
Similarly,
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\biggl( \frac{2}{\rho}\biggr)\mathfrak{T}_{22} = \int_V  u_2 u_2 d^3x </math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\iiint  [u_2^2] ~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\iiint  \biggl\{ - \biggl[ \frac{b^2}{b^2 + c^2}\biggr] \zeta_1 z + \biggl[ \frac{b^2}{b^2+a^2}\biggr] \zeta_3 x  \biggr\}^2 ~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \frac{b^2}{b^2 + c^2}\biggr]^2 \zeta_1^2  \biggl[ \frac{I_{33}}{\rho} \biggr]
 +
+
 +
\biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \zeta_3^2 \biggl[ \frac{I_{11}}{\rho} \biggr] \, ;</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\biggl( \frac{2}{\rho}\biggr)\mathfrak{T}_{33} = \int_V  u_3 u_3 d^3x </math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\iiint  [u_2^2] ~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\iiint  \biggl\{ - \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 x + \biggl[ \frac{c^2}{c^2+b^2}\biggr] \zeta_1 y \biggr\}^2 ~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~
 +
\biggl[ \frac{c^2}{c^2 + a^2}\biggr]^2 \zeta_2^2  \biggl[ \frac{I_{11}}{\rho} \biggr]
 +
+
 +
\biggl[ \frac{c^2}{c^2+b^2}\biggr]^2 \zeta_1^2 \biggl[ \frac{I_{22}}{\rho} \biggr] \, .</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 +
===Off-Diagonal Elements===
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\biggl( \frac{2}{\rho}\biggr)\mathfrak{T}_{23} = \int_V  u_2 u_3 d^3x </math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\iiint  [u_2 u_3] ~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\iiint 
 +
\biggl\{ - \biggl[ \frac{b^2}{b^2 + c^2}\biggr] \zeta_1 z + \biggl[ \frac{b^2}{b^2+a^2}\biggr] \zeta_3 x\biggr\}
 +
\biggl\{ - \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 x + \biggl[ \frac{c^2}{c^2+b^2}\biggr] \zeta_1 y \biggr\}
 +
~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\iiint 
 +
\biggl\{ - \biggl[ \frac{b^2}{b^2 + c^2}\biggr] \zeta_1 z \biggr\}
 +
\biggl\{ - \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 x + \biggl[ \frac{c^2}{c^2+b^2}\biggr] \zeta_1 y \biggr\}
 +
~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
&nbsp;
 +
  </td>
 +
  <td align="left">
 +
<math>~+ \iiint
 +
\biggl\{\biggl[ \frac{b^2}{b^2+a^2}\biggr] \zeta_3 x\biggr\}
 +
\biggl\{ - \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 x + \biggl[ \frac{c^2}{c^2+b^2}\biggr] \zeta_1 y \biggr\}
 +
~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~-~\iiint
 +
\biggl\{\biggl[ \frac{b^2}{b^2+a^2}\biggr]  \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 \zeta_3  \biggr\}
 +
x^2~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~- ~\frac{I_{11}}{\rho}
 +
\biggl[ \frac{b^2}{b^2+a^2}\biggr]  \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 \zeta_3 
 +
</math>
 +
  </td>
 +
</tr>
 +
<tr><td align="center" colspan="3">[ [[User:Tohline/Appendix/References#EFE|EFE]], <font color="#00CC00">Chapter 7, &sect;47, p. 130, Eq. (8)</font> ]</td></tr>
 +
</table>
 +
Similarly,
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\biggl( \frac{2}{\rho}\biggr)\mathfrak{T}_{12} = \int_V  u_1 u_2 d^3x </math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\iiint  [u_1 u_2] ~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\iiint 
 +
\biggl\{ - \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \zeta_3 y + \biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 z \biggr\}
 +
\biggl\{ - \biggl[ \frac{b^2}{b^2 + c^2}\biggr] \zeta_1 z + \biggl[ \frac{b^2}{b^2+a^2}\biggr] \zeta_3 x \biggr\}
 +
~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~-~ 
 +
\biggl[ \frac{a^2}{a^2+c^2}\biggr] 
 +
\biggl[ \frac{b^2}{b^2 + c^2}\biggr] \zeta_1 \zeta_2 
 +
\iiint z^2~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~-~  \frac{I_{33}}{\rho}
 +
\biggl[ \frac{a^2}{a^2+c^2}\biggr] 
 +
\biggl[ \frac{b^2}{b^2 + c^2}\biggr] \zeta_1 \zeta_2 
 +
\, ;</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\biggl( \frac{2}{\rho}\biggr)\mathfrak{T}_{31} = \int_V  u_3 u_1 d^3x </math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\iiint  [u_3 u_1] ~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\iiint 
 +
\biggl\{ - \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 x + \biggl[ \frac{c^2}{c^2+b^2}\biggr] \zeta_1 y \biggr\}
 +
\biggl\{ - \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \zeta_3 y + \biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 z \biggr\}
 +
~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~ -~
 +
\biggl[ \frac{c^2}{c^2+b^2}\biggr] 
 +
\biggl[ \frac{a^2}{a^2 + b^2}\biggr] \zeta_1\zeta_3 
 +
\iiint y^2~dx ~dy ~dz</math>
 +
  </td>
 +
</tr>
 +
 +
<tr>
 +
  <td align="right">
 +
&nbsp;
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~ -~ \frac{I_{22}}{\rho}
 +
\biggl[ \frac{c^2}{c^2+b^2}\biggr] 
 +
\biggl[ \frac{a^2}{a^2 + b^2}\biggr] \zeta_1\zeta_3  \, .
 +
</math>
 +
  </td>
 +
</tr>
 +
</table>
 +
 +
And, finally,
 +
<table border="0" cellpadding="5" align="center">
 +
 +
<tr>
 +
  <td align="right">
 +
<math>~\mathfrak{T}_{32}</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\mathfrak{T}_{23} \, ;</math>
 +
  </td>
 +
<td align="center">&nbsp; &nbsp; &nbsp;</td>
 +
  <td align="right">
 +
<math>~\mathfrak{T}_{21}</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\mathfrak{T}_{12} \, ;</math>
 +
  </td>
 +
<td align="center">&nbsp; &nbsp; &nbsp; and,&nbsp; &nbsp; &nbsp;</td>
 +
  <td align="right">
 +
<math>~\mathfrak{T}_{13}</math>
 +
  </td>
 +
  <td align="center">
 +
<math>~=</math>
 +
  </td>
 +
  <td align="left">
 +
<math>~\mathfrak{T}_{31} \, .</math>
   </td>
   </td>
</tr>
</tr>

Current revision as of 16:02, 8 September 2020


Contents

Steady-State 2nd-Order Tensor Virial Equations

Whitworth's (1981) Isothermal Free-Energy Surface
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Summary

Drawing from our accompanying discussion of virial equations as viewed from a rotating frame of reference, here we employ the 2nd-order tensor virial equation (TVE),

~0

~=

~
2 \mathfrak{T}_{ij} + \mathfrak{W}_{ij} + \delta_{ij}\Pi 
+ \Omega^2 I_{ij} - \Omega_i\Omega_k I_{kj} + 2\epsilon_{ilm}\Omega_m \int_V \rho u_lx_j dx \, ,

to determine the equilibrium conditions of uniform-density ~(\rho) ellipsoids that have semi-axes, ~(a_1, a_2, a_3) \leftrightarrow (a, b, c), and an internal velocity field, ~\vec{u} (as prescribed below), that preserves this specified ellipsoidal shape, as viewed from a frame of reference that is rotating with angular velocity, ~\vec\Omega. Because each of the indices, ~i and ~j, run from 1 to 3, inclusive, this TVE appears to provide nine equilibrium constraints; and once the values of the density and the three semi-axes are specified, there appear to be seven unknowns: ~\Pi and the three pairs of velocity-field components ~(\Omega_1, \zeta_1), ~(\Omega_2, \zeta_2), ~(\Omega_3, \zeta_3). In practice, however, only five constraints are relevant/independent because, as is encapsulated in …

Riemann's Fundamental Theorem

… non-trivial solutions are obtained only if no more than two of the three pairs of velocity-field components are different from zero.

Following EFE, we will set ~\Omega_1 = \zeta_1 = 0, in which case the only applicable TVE constraint relations are the five identified in the following table of equations.


Indices Each Associated 2nd-Order TVE Expression
~i ~j
~1 ~1

~0

~=

~
\biggl[ \frac{3\cdot 5}{2^2\pi a b c\rho} \biggr] \Pi
+\biggl\{ 
( \Omega_2^2 + \Omega_3^2)  
+ 2  \biggl[ \frac{b^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3 
+ 2  \biggl[ \frac{c^2}{c^2 + a^2}\biggr]\Omega_2 \zeta_2 
~-~(2\pi G\rho) A_1 
\biggr\} a^2 
+ \biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 b^2
+ \biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \zeta_2^2  c^2

~2 ~2

~0

~=

~
\biggl[ \frac{3\cdot 5}{2^2\pi a b c \rho} \biggr]\Pi
+ \biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \zeta_3^2 a^2
+ \biggl\{
\Omega_3^2  
+ 2 \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3  
~-~( 2\pi G \rho) A_2 
\biggr\}b^2

~3 ~3

~0

~=

~
\biggl[ \frac{3\cdot 5}{2^2\pi abc\rho} \biggr]\Pi
+ \biggl[ \frac{c^2}{c^2 + a^2}\biggr]^2 \zeta_2^2  a^2
+ \biggl\{
\Omega_2^2   + 2 \biggl[ \frac{a^2}{a^2+c^2}\biggr]\Omega_2 \zeta_2 
- (2\pi G \rho)A_3 
\biggr\}c^2

~2 ~3

~0

~=

~\biggl\{
1  
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{a^2}{a^2 + c^2 }\biggr] \biggl[ 2 + \frac{\zeta_3}{\Omega_3}\biggl( \frac{b^2}{b^2+a^2}\biggr) \biggr]     
\biggr\} \Omega_2\Omega_3c^2

~3 ~2

~0

~=

~\biggl\{
1  
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{a^2}{a^2+b^2}\biggr]  \biggl[2 +  \frac{\zeta_2}{\Omega_2} \biggl( \frac{c^2}{c^2 + a^2} \biggr) \biggr]   
\biggr\} \Omega_2 \Omega_3b^2

General Coefficient Expressions

In the context of our discussion of configurations that are triaxial ellipsoids, we begin by adopting the ~(\ell, m, s) subscript notation to identify which semi-axis length is the (largest, medium-length, smallest). As has been detailed in an accompanying chapter, the gravitational potential anywhere inside or on the surface of an homogeneous ellipsoid may be given analytically in terms of the following three coefficient expressions:


~\frac{A_\ell}{a_\ell a_m a_s}


~=

~\frac{2}{a_\ell^3}
\biggl[  \frac{F(\theta,k) - E(\theta,k)}{k^2 \sin^3\theta} \biggr] \, ,


~\frac{A_s}{a_\ell a_m a_s}


~=


~\frac{2}{a_\ell^3} \biggl[  \frac{(a_m/a_s) \sin\theta - E(\theta,k)}{(1-k^2) \sin^3\theta} \biggr] \, ,


~\frac{A_m}{a_\ell a_m a_s} = \frac{2 - (A_\ell + A_s)}{a_\ell a_m a_s}


~=

~
\frac{ 2}{a_\ell^3 }
\biggl[ \frac{
E(\theta, k) 
-~(1-k^2)
F(\theta, k)
-~(a_s/a_m)k^2\sin\theta}{k^2 (1-k^2)\sin^3\theta}
\biggr] \, ,

where, ~F(\theta,k) and ~E(\theta,k) are incomplete elliptic integrals of the first and second kind, respectively, with arguments,

~\theta = \cos^{-1} \biggl(\frac{a_s}{a_\ell} \biggr)

      and      

~k = \biggl[\frac{1 - (a_m/a_\ell)^2}{1 - (a_s/a_\ell)^2} \biggr]^{1/2} \, .

Specific Case of a1 > a2 > a3

When we discuss configurations in which ~a_1 > a_2 > a_3 > 0 — such as Jacobi, Dedekind, or most Riemann S-Type ellipsoids — we must adopt the associations, ~(A_1, a_1) \leftrightarrow (A_\ell, a_\ell), ~(A_2, a_2) \leftrightarrow (A_m, a_m), and ~(A_3, a_3) \leftrightarrow (A_s, a_s). This means that the coefficients, ~A_1, ~A_2, and ~A_3 are defined by the expressions,


~A_1


~=

~2\biggl(\frac{a_2}{a_1}\biggr)\biggl(\frac{a_3}{a_1}\biggr)
\biggl[  \frac{F(\theta,k) - E(\theta,k)}{k^2 \sin^3\theta} \biggr] \, ,


~A_3


~=


~2\biggl(\frac{a_2}{a_1}\biggr) \biggl[  \frac{(a_2/a_1) \sin\theta - (a_3/a_1)E(\theta,k)}{(1-k^2) \sin^3\theta} \biggr] \, ,


~A_2


~=

~2 - (A_1+A_3) \, ,

where, the arguments of the incomplete elliptic integrals are,

~\theta = \cos^{-1} \biggl(\frac{a_3}{a_1} \biggr)

      and      

~k = \biggl[\frac{1 - (a_2/a_1)^2}{1 - (a_3/a_1)^2} \biggr]^{1/2} \, .

[ EFE, Chapter 3, §17, Eq. (32) ]

Specific Case of a1 > a3 > a2

When we discuss configurations in which ~a_1 > a_3 > a_2 > 0 — these are usually referred to in EFE as prolate S-Type Riemann ellipsoids — we must instead adopt the associations, ~(A_1, a_1) \leftrightarrow (A_\ell, a_\ell), ~(A_2, a_2) \leftrightarrow (A_s, a_s), and ~(A_3, a_3) \leftrightarrow (A_m, a_m). This means that the coefficients, ~A_1, ~A_2, and ~A_3 are defined by the expressions,


~A_1


~=

~2 \biggl( \frac{a_2}{a_1} \biggr)\biggl( \frac{a_3}{a_1} \biggr) 
\biggl[  \frac{F(\theta,k) - E(\theta,k)}{k^2 \sin^3\theta} \biggr] \, ,


~A_2


~=


~2 \biggl( \frac{a_3}{a_1} \biggr) \biggl[  \frac{(a_3/a_1) \sin\theta - (a_2/a_1)E(\theta,k)}{(1-k^2) \sin^3\theta} \biggr] \, ,


~A_3 = 2 - (A_1 + A_2)


~=

~
\frac{2a_2 a_3}{a_1^2} 
\biggl[ \frac{
E(\theta, k) 
-~(1-k^2)
F(\theta, k)
-~(a_2/a_3)k^2\sin\theta}{k^2 (1-k^2)\sin^3\theta}
\biggr] \, ,

where, the arguments of the incomplete elliptic integrals of the first and second kind are,

~\theta = \cos^{-1} \biggl(\frac{a_2}{a_1} \biggr)

      and      

~k = \biggl[\frac{1 - (a_3/a_1)^2}{1 - (a_2/a_1)^2} \biggr]^{1/2} \, .

[ EFE, Chapter 7, §48d, footnote to Table VII (p. 143) ]

NOTE: All irrotational ellipsoids belong to this category of configurations.

Specific Case of a2 > a1 > a3

When we discuss configurations in which ~a_2 > a_1 > a_3 > 0 — for example, most Riemann ellipsoids of Types I, II, & III — we must instead adopt the associations, ~(A_1, a_1) \leftrightarrow (A_m, a_m), ~(A_2, a_2) \leftrightarrow (A_\ell, a_\ell), and ~(A_3, a_3) \leftrightarrow (A_s, a_s). This means that the coefficients, ~A_1, ~A_2, and ~A_3 are defined by the expressions,


~A_2


~=

~2 \biggl( \frac{a_1}{a_2} \biggr)\biggl( \frac{a_3}{a_2} \biggr)
\biggl[  \frac{F(\theta,k) - E(\theta,k)}{k^2 \sin^3\theta} \biggr] \, ,


~A_3


~=


~2\biggl( \frac{a_1}{a_2}\biggr) \biggl[  \frac{(a_1/a_2) \sin\theta - (a_3/a_2)E(\theta,k)}{(1-k^2) \sin^3\theta} \biggr]  \, ,


~A_1 = 2 - (A_2 + A_3)


~=

~
\frac{ 2a_1 a_3}{a_2^2 }
\biggl[ \frac{
E(\theta, k) 
-~(1-k^2)
F(\theta, k)
-~(a_3/a_1)k^2\sin\theta}{k^2 (1-k^2)\sin^3\theta}
\biggr] \, ,

where, the arguments of the incomplete elliptic integrals are,

~\theta = \cos^{-1} \biggl(\frac{a_3}{a_2} \biggr)

      and      

~k = \biggl[\frac{1 - (a_1/a_2)^2}{1 - (a_3/a_2)^2} \biggr]^{1/2} \, .

Oblate Spheroids [a2 = a1 > a3]

Starting with the case of ~a_2 > a_1 > a_3 > 0 and setting ~a_2 = a_1, we recognize, first, that ~k = 0. Hence, we have,


~A_3


~=


~2\biggl[  \frac{ \sin\theta - (a_3/a_1)E(\theta,0)}{\sin^3\theta} \biggr]  \, ,

Adopted (Internal) Velocity Field

EFE (p. 130) states that the … kinematical requirement, that the motion ~(\vec{u}), associated with ~\vec{\zeta}, preserves the ellipsoidal boundary, leads to the following expressions for its components:

~u_1

~=

~- \biggl[ \frac{a_1^2}{a_1^2 + a_2^2}\biggr] \zeta_3 x_2 + \biggl[ \frac{a_1^2}{a_1^2+a_3^2}\biggr] \zeta_2 x_3 \, ,

~u_2

~=

~- \biggl[ \frac{a_2^2}{a_2^2 + a_3^2}\biggr] \zeta_1 x_3 + \biggl[ \frac{a_2^2}{a_2^2+a_1^2}\biggr] \zeta_3 x_1 \, ,

~u_3

~=

~- \biggl[ \frac{a_3^2}{a_3^2 + a_1^2}\biggr] \zeta_2 x_1 + \biggl[ \frac{a_3^2}{a_3^2+a_2^2}\biggr] \zeta_1 x_2 \, .

[ EFE, Chapter 7, §47, Eq. (1) ]

Equilibrium Expressions

[EFE §11(b), p. 22] Under conditions of a stationary state, [the tensor virial equation] gives,

~2 \mathfrak{T}_{ij} + \mathfrak{W}_{ij}

~=

~- \delta_{ij}\Pi \, .

[This] provides six integral relations which must obtain whenever the conditions are stationary.

When viewing the (generally ellipsoidal) configuration from a rotating frame of reference, the 2nd-order TVE takes on the more general form:

~0

~=

~
2 \mathfrak{T}_{ij} + \mathfrak{W}_{ij} + \delta_{ij}\Pi 
+ \Omega^2 I_{ij} - \Omega_i\Omega_k I_{kj} + 2\epsilon_{ilm}\Omega_m \int_V \rho u_lx_j dx
\, .

[ EFE, Chapter 2, §12, Eq. (64) ]

EFE (p. 57) also shows that … The potential energy tensor … for a homogeneous ellipsoid is given by

~\frac{\mathfrak{W}_{ij}}{\pi G\rho}

~=

~-2A_i I_{ij} \, ,

[ EFE, Chapter 3, §22, Eq. (128) ]

where

~I_{ij}

~=

~\tfrac{1}{5} Ma_i^2 \delta_{ij} \, ,

[ EFE, Chapter 3, §22, Eq. (129) ]

is the moment of inertia tensor. Expressions for all nine components of the kinetic energy tensor, ~\mathfrak{T}_{ij} are derived in Appendix E, below; and expressions for each of the six Coriolis components can be found in Appendices B, C, & D.

The Three Diagonal Elements

For ~i = j = 1, we have,

~0

~=

~
2 \mathfrak{T}_{11} + \mathfrak{W}_{11} + \Pi 
+ \Omega^2 I_{11} - \Omega_1\Omega_k I_{k1} + 2\epsilon_{1lm}\Omega_m \int_V \rho u_lx_1 d^3x

 

~=

~
2 \mathfrak{T}_{11} + \mathfrak{W}_{11} + \Pi + \Omega^2 I_{11} 
- \Omega_1^2I_{11} 
+ 2 \Omega_3 \int_V \rho u_2x_1 ~d^3x
- 2\Omega_2 \int_V \rho u_3x_1 ~d^3x

 

~=

~
2 \mathfrak{T}_{11} + \mathfrak{W}_{11} + \Pi 
+( \Omega_2^2 + \Omega_3^2) I_{11} 
+ 2 \Omega_3\rho \int_V u_2x ~d^3x
- 2\Omega_2\rho \int_V  u_3 x~ d^3x

 

~=

~
\biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 I_{22}
+
\biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \zeta_2^2 I_{33}  
~-~(2\pi G\rho) A_1 I_{11} + \Pi 
+( \Omega_2^2 + \Omega_3^2) I_{11} 
+ 2  \biggl[ \frac{b^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3 I_{11}
+ 2  \biggl[ \frac{c^2}{c^2 + a^2}\biggr]\Omega_2 \zeta_2 I_{11}

 

~=

~
\Pi 
+ \biggl\{
( \Omega_2^2 + \Omega_3^2)  
+ 2  \biggl[ \frac{b^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3 
+ 2  \biggl[ \frac{c^2}{c^2 + a^2}\biggr]\Omega_2 \zeta_2 
~-~(2\pi G\rho) A_1 
\biggr\} I_{11}
+
\biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 I_{22}
+
\biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \zeta_2^2 I_{33}

~\Rightarrow~~~ -\biggl[ \frac{3\cdot 5}{2^2\pi a b c\rho} \biggr] \Pi

~=

~
\biggl\{ 
( \Omega_2^2 + \Omega_3^2)  
+ 2  \biggl[ \frac{b^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3 
+ 2  \biggl[ \frac{c^2}{c^2 + a^2}\biggr]\Omega_2 \zeta_2 
~-~(2\pi G\rho) A_1 
\biggr\} a^2 
+ \biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 b^2
+ \biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \zeta_2^2  c^2  \, .

Once we choose the values of the (semi) axis lengths ~(a, b, c) of an ellipsoid — from which the value of ~A_1 can be immediately determined — along with a specification of ~\rho, this equation has the following five unknowns: ~\Pi, \Omega_2, \Omega_3,  \zeta_2, \zeta_3. Similarly, for ~i = j = 2,

~0

~=

~
2 \mathfrak{T}_{22} + \mathfrak{W}_{22} + \Pi 
+ \Omega^2 I_{22} - \Omega_2\Omega_k I_{k2} + 2\epsilon_{2lm}\Omega_m \int_V \rho u_lx_2 d^3x

 

~=

~
2 \mathfrak{T}_{22} + \mathfrak{W}_{22} + \Pi 
+ (\Omega_1^2 + \Omega_3^2) I_{22} + 2\Omega_1 \rho \int_V u_3 y ~d^3x
- 2\Omega_3 \rho \int_V u_1 y ~d^3x

 

~=

~
\biggl[ \frac{b^2}{b^2 + c^2}\biggr]^2 \zeta_1^2  I_{33}
+
\biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \zeta_3^2 I_{11}
~-~( 2\pi G \rho) A_2 {I}_{22} 
+ \Pi 
+ (\Omega_1^2 + \Omega_3^2) I_{22} 
+ 2 \biggl[ \frac{c^2}{c^2+b^2}\biggr]\Omega_1 \zeta_1 I_{22} 
+ 2 \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3  I_{22}

 

~=

~
\Pi 
+
\biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \zeta_3^2 I_{11}
+ \biggl\{
(\Omega_1^2 + \Omega_3^2)  
+ 2 \biggl[ \frac{c^2}{c^2+b^2}\biggr]\Omega_1 \zeta_1  
+ 2 \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3  
~-~( 2\pi G \rho) A_2 
\biggr\}{I}_{22} 
+ \biggl[ \frac{b^2}{b^2 + c^2}\biggr]^2 \zeta_1^2  I_{33}

~\Rightarrow~~~-\biggl[ \frac{3\cdot 5}{2^2\pi a b c \rho} \biggr]\Pi

~=

~
\biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \zeta_3^2 a^2
+ \biggl\{
(\Omega_1^2 + \Omega_3^2)  
+ 2 \biggl[ \frac{c^2}{c^2+b^2}\biggr]\Omega_1 \zeta_1  
+ 2 \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3  
~-~( 2\pi G \rho) A_2 
\biggr\}b^2 
+ \biggl[ \frac{b^2}{b^2 + c^2}\biggr]^2 \zeta_1^2  c^2 \, .

This gives us a second equation, but an additional pair of (for a total of seven) unknowns: ~\Omega_1, \zeta_1. For the third diagonal element — that is, for ~i=j=3 — we have,

~0

~=

~
2 \mathfrak{T}_{33} + \mathfrak{W}_{33} + \Pi 
+ \Omega^2 I_{33} - \Omega_3\Omega_k I_{k3} + 2\epsilon_{3lm}\Omega_m \int_V \rho u_lx_3 ~d^3x

 

~=

~
2 \mathfrak{T}_{33} + \mathfrak{W}_{33} + \Pi 
+ (\Omega_1^2 + \Omega_2^2) I_{33}  + 2\Omega_2 \rho \int_V u_1 z ~d^3x
- 2\Omega_1 \rho  \int_V u_2 z ~d^3x

 

~=

~\biggl[ \frac{c^2}{c^2 + a^2}\biggr]^2 \zeta_2^2  I_{11}
+
\biggl[ \frac{c^2}{c^2+b^2}\biggr]^2 \zeta_1^2 I_{22}
- (2\pi G \rho)A_3 I_{33} + \Pi 
+ (\Omega_1^2 + \Omega_2^2) I_{33}  + 2 \biggl[ \frac{a^2}{a^2+c^2}\biggr]\Omega_2 \zeta_2 I_{33}
+ 2 \biggl[\frac{b^2}{b^2 + c^2}\biggr] \Omega_1 \zeta_1 I_{33}

 

~=

~
\Pi
+
\biggl[ \frac{c^2}{c^2 + a^2}\biggr]^2 \zeta_2^2  I_{11}
+
\biggl[ \frac{c^2}{c^2+b^2}\biggr]^2 \zeta_1^2 I_{22}
+ \biggl\{
(\Omega_1^2 + \Omega_2^2)   + 2 \biggl[ \frac{a^2}{a^2+c^2}\biggr]\Omega_2 \zeta_2 
+ 2 \biggl[\frac{b^2}{b^2 + c^2}\biggr] \Omega_1 \zeta_1  
- (2\pi G \rho)A_3 
\biggr\}I_{33}

~\Rightarrow ~~~ -\biggl[ \frac{3\cdot 5}{2^2\pi abc\rho} \biggr]\Pi

~=

~
\biggl[ \frac{c^2}{c^2 + a^2}\biggr]^2 \zeta_2^2  a^2
+
\biggl[ \frac{c^2}{c^2+b^2}\biggr]^2 \zeta_1^2 b^2
+ \biggl\{
(\Omega_1^2 + \Omega_2^2)   + 2 \biggl[ \frac{a^2}{a^2+c^2}\biggr]\Omega_2 \zeta_2 
+ 2 \biggl[\frac{b^2}{b^2 + c^2}\biggr] \Omega_1 \zeta_1  
- (2\pi G \rho)A_3 
\biggr\}c^2 \, .

This gives us three equations vs. seven unknowns.

Off-Diagonal Elements

Notice that the off-diagonal components of both ~I_{ij} and ~\mathfrak{W}_{ij} are zero. Hence, the equilibrium expression that is dictated by each off-diagonal component of the 2nd-order TVE is,

~0

~=

~
2 \mathfrak{T}_{ij} - \Omega_i\Omega_k I_{kj} + 2\epsilon_{ilm}\Omega_m \int_V \rho u_lx_j d^3x
\, .

For example — as is explicitly illustrated on p. 130 of EFE — for ~i=2 and ~j=3,

~0

~=

~
2 \mathfrak{T}_{23} - \Omega_2\Omega_3 I_{33} + 2\Omega_1 \cancelto{0}{\int_V \rho u_3x_3 d^3x}
- 2\Omega_3 \int_V \rho u_1x_3 d^3x \, ,

[ EFE, Chapter 7, §47, Eq. (3) ]

whereas for ~i=3 and ~j=2,

~0

~=

~
2 \mathfrak{T}_{32} - \Omega_3 \Omega_2 I_{22} + 2\Omega_2 \int_V \rho u_1x_2 d^3x
- 2\Omega_1 \cancelto{0}{\int_V \rho u_2 x_2 d^3x}
\, .

[ EFE, Chapter 7, §47, Eq. (4) ]

Given our adoption of a uniform-density configuration whose surface has a precisely ellipsoidal shape and, along with it, our adoption of the above specific prescription for the internal velocity field, ~\vec{u}, we recognize that,

~\int_V \rho u_i x_j d^3x

~=

~0

      if    ~i = j \, .
[ EFE, Chapter 7, §47, Eq. (5) ]

This has allowed us to set to zero one of the integrals in each of these last two expressions. In what follows, we will benefit from recognizing, as well, that,

~\mathfrak{T}_{32}

~=

~\mathfrak{T}_{23}

~=

~\frac{1}{2} \int_V \rho v_2 v_3 d^3x \, .

Our first off-diagonal element is, then,

~0

~=

~
2 \mathfrak{T}_{23} - \Omega_2\Omega_3 I_{33} 
- 2\Omega_3 \rho \int_V u_1 z d^3x

 

~=

~
- ~
\biggl[ \frac{b^2}{b^2+a^2}\biggr]  \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 \zeta_3 a^2
- \Omega_2\Omega_3 c^2 
- 2 \biggl[ \frac{a^2}{a^2+c^2}\biggr]\Omega_3 \zeta_2 c^2

 

~=

~\biggl\{
\Omega_2\Omega_3  
+ \biggl[ \frac{\zeta_2 a^2}{a^2 + c^2 }\biggr] \biggl[ 2\Omega_3 + \frac{\zeta_3 b^2}{b^2+a^2}\biggr]     
\biggr\} c^2

 

~=

~\biggl\{
1  
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{a^2}{a^2 + c^2 }\biggr] \biggl[ 2 + \frac{\zeta_3}{\Omega_3}\biggl( \frac{b^2}{b^2+a^2}\biggr) \biggr]     
\biggr\} \Omega_2\Omega_3c^2 \, .

The second is,

~0

~=

~
2 \mathfrak{T}_{32} - \Omega_3 \Omega_2 I_{22} + 2\Omega_2 \rho \int_V u_1 y d^3x

 

~=

~
- ~
\biggl[ \frac{b^2}{b^2+a^2}\biggr]  \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 \zeta_3  a^2
- \Omega_3 \Omega_2 b^2 
- 2  \biggl[ \frac{a^2}{a^2 + b^2}\biggr]\Omega_2 \zeta_3 b^2

 

~=

~\biggl\{
\Omega_2 \Omega_3  
+ \biggl[ \frac{\zeta_3 a^2}{a^2+b^2}\biggr]  \biggl[2\Omega_2 +  \frac{\zeta_2 c^2}{c^2 + a^2}\biggr]   
\biggr\} b^2

 

~=

~\biggl\{
1  
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{a^2}{a^2+b^2}\biggr]  \biggl[2 +  \frac{\zeta_2}{\Omega_2} \biggl( \frac{c^2}{c^2 + a^2} \biggr) \biggr]   
\biggr\} \Omega_2 \Omega_3b^2 \, .

How Solution is Obtained

Adding this pair of governing expressions we obtain,

~0

~=

~
\biggl[ 2 \mathfrak{T}_{23} - \Omega_2\Omega_3 I_{33} 
- 2\Omega_3 \int_V \rho u_1x_3 dx \biggr]
+
\biggl[2 \mathfrak{T}_{32} - \Omega_3 \Omega_2 I_{22} + 2\Omega_2 \int_V \rho u_1x_2 dx
\biggr]

 

~=

~4 \mathfrak{T}_{23} - \Omega_2\Omega_3(I_{22}+ I_{33} )
+
2 \int_V \rho u_1 (\Omega_2 x_2 - \Omega_3 x_3) dx \, ;

[ EFE, Chapter 7, §47, Eq. (6) ]

and subtracting the pair gives,

~0

~=

~
\biggl[ 2 \mathfrak{T}_{23} - \Omega_2\Omega_3 I_{33} 
- 2\Omega_3 \int_V \rho u_1x_3 dx \biggr]
-
\biggl[2 \mathfrak{T}_{32} - \Omega_3 \Omega_2 I_{22} + 2\Omega_2 \int_V \rho u_1x_2 dx
\biggr]

 

~=

~
\Omega_2\Omega_3 (I_{22} - I_{33} )
- 2 \int_V \rho u_1 ( \Omega_2 x_2 + \Omega_3 x_3) dx \, .

[ EFE, Chapter 7, §47, Eq. (7) ]

Various Degrees of Simplification

Riemann Ellipsoids of Types I, II, & III

In this, most general, case, the two vectors ~\vec{\Omega} and ~\vec\zeta are not parallel to any of the principal axes of the ellipsoid, and they are not aligned with each other, but they both lie in the ~y-z-plane — that is to say, ~(\Omega_1, \zeta_1) = (0, 0). For a given specified density ~(\rho) and choice of the three semi-axes ~(a_1, a_2, a_3) \leftrightarrow (a, b, c), all five of the expressions displayed in our above Summary Table must be used in order to determine the equilibrium configuration's associated values of the five unknowns: ~\Pi, (\Omega_2, \zeta_2), (\Omega_3, \zeta_3). Here we show how these five unknowns can be derived from the five constraint equations, closely following the analysis that is presented in §47 (pp. 129 - 132) of [ EFE ].

Constraints Due to Off-Diagonal Elements

We begin by subtracting the constraint equation provided by the first off-diagonal element ~(i, j) = (2, 3) from the constraint equation provided by the second off-diagonal element ~(i, j) = (3, 2) . This gives,

~\biggl\{
1  
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{a^2}{a^2 + c^2 }\biggr] \biggl[ 2 + \frac{\zeta_3}{\Omega_3}\biggl( \frac{b^2}{b^2+a^2}\biggr) \biggr]     
\biggr\} \Omega_2\Omega_3c^2

~=

~\biggl\{
1  
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{a^2}{a^2+b^2}\biggr]  \biggl[2 +  \frac{\zeta_2}{\Omega_2} \biggl( \frac{c^2}{c^2 + a^2} \biggr) \biggr]   
\biggr\} \Omega_2 \Omega_3b^2

~\Rightarrow ~~~ 
c^2  
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2 a^2 c^2}{a^2 + c^2 }\biggr] \biggl[ 1 + \frac{\zeta_3}{2 \Omega_3}\biggl( \frac{b^2}{b^2+a^2}\biggr) \biggr]

~=

~
b^2 
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{2 a^2 b^2}{a^2+b^2}\biggr]  \biggl[1 +  \frac{\zeta_2}{2\Omega_2} \biggl( \frac{c^2}{c^2 + a^2} \biggr) \biggr]

~\Rightarrow ~~~ 
c^2  
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2 a^2 c^2}{a^2 + c^2 }\biggr]      
+ \frac{\zeta_2}{\Omega_2} \cdot \frac{\zeta_3}{\Omega_3} \biggl[ \frac{a^2 c^2}{a^2 + c^2 }\biggr] \biggl[ \frac{b^2}{b^2+a^2} \biggr]

~=

~
b^2 
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{2 a^2 b^2}{a^2+b^2}\biggr]    
+ \frac{\zeta_3}{\Omega_3} \cdot \frac{\zeta_2}{\Omega_2} \biggl[ \frac{a^2 b^2}{a^2+b^2}\biggr]  \biggl[ \frac{c^2}{c^2 + a^2} \biggr]

~\Rightarrow ~~~ 
c^2  + \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2 a^2 c^2}{a^2 + c^2 }\biggr]

~=

~
b^2 
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{2 a^2 b^2}{a^2+b^2}\biggr]    \, .

[ EFE, Chapter 7, §47, Eq. (11) ]

Adding the two instead gives,

~
0

~=

~
\biggl\{
1  
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{a^2}{a^2 + c^2 }\biggr] \biggl[ 2 + \frac{\zeta_3}{\Omega_3}\biggl( \frac{b^2}{b^2+a^2}\biggr) \biggr]     
\biggr\} \Omega_2\Omega_3c^2 
+
\biggl\{
1  
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{a^2}{a^2+b^2}\biggr]  \biggl[2 +  \frac{\zeta_2}{\Omega_2} \biggl( \frac{c^2}{c^2 + a^2} \biggr) \biggr]   
\biggr\} \Omega_2 \Omega_3b^2

 

~=

~
b^2 + c^2 
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{a^2 c^2}{a^2 + c^2 }\biggr] \biggl[ 2 + \frac{\zeta_3}{\Omega_3}\biggl( \frac{b^2}{b^2+a^2}\biggr) \biggr]     
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{a^2 b^2}{a^2+b^2}\biggr]  \biggl[2 +  \frac{\zeta_2}{\Omega_2} \biggl( \frac{c^2}{c^2 + a^2} \biggr) \biggr]

 

~=

~
b^2 + c^2 
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2a^2 c^2}{a^2 + c^2 }\biggr]    
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{2a^2 b^2}{a^2+b^2}\biggr]     
+ \frac{\zeta_2}{\Omega_2} \cdot  \frac{\zeta_3}{\Omega_3} \biggl[ \frac{2a^2 b^2 c^2}{(a^2 + c^2)( b^2+a^2 ) }\biggr]      \, .

[ EFE, Chapter 7, §47, Eq. (10) ]

The first of these relations cleanly gives an expression for the frequency ratio, ~\zeta_3/\Omega_3, in terms of the other frequency ratio, ~\zeta_2/\Omega_2. This allows us to rewrite the second relation in terms of the ratio, ~\zeta_2/\Omega_2, alone. We obtain,

~0

~=

~
b^2 + c^2 
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2a^2 c^2}{a^2 + c^2 }\biggr]    
+ \biggl\{ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{2a^2 b^2}{a^2+b^2}\biggr] \biggr\}
+ \frac{\zeta_2}{\Omega_2} \biggl[\frac{c^2 }{(a^2 + c^2) }  \biggr]  \cdot  \biggl\{ \frac{\zeta_3}{\Omega_3} \biggl[ \frac{2a^2 b^2 }{( b^2+a^2 ) }\biggr] \biggr\}

 

~=

~
b^2 + c^2 
+ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2a^2 c^2}{a^2 + c^2 }\biggr]    
+ \biggl\{ c^2 - b^2  + \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2 a^2 c^2}{a^2 + c^2 }\biggr] \biggr\}
+ \frac{\zeta_2}{\Omega_2} \biggl[\frac{c^2 }{(a^2 + c^2) }  \biggr]  \cdot  \biggl\{ c^2 - b^2  + \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2 a^2 c^2}{a^2 + c^2 }\biggr] \biggr\}

 

~=

~
2c^2 
+ \frac{\zeta_2}{\Omega_2} \biggl[\frac{c^2 }{a^2 + c^2 }  \biggr] (4a^2 + c^2 - b^2  )
+  \biggl\{ \frac{\zeta_2}{\Omega_2}\biggl[ \frac{c^2}{a^2 + c^2 }\biggr] \biggr\}^22a^2

ASIDE:   Alternatively, given that,

~ 
\frac{\zeta_2}{\Omega_2}\biggl[ \frac{c^2}{a^2 + c^2 }\biggr]

~=

~
\frac{1}{2a^2}\biggl[ b^2 - c^2+ \frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr) \biggr]

the quadratic equation that governs the value of the frequency ratio, ~\zeta_3/\Omega_3 is …

~0

~=

~
4 a^2 c^2 
+ \biggl[ b^2 - c^2+ \frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr) \biggr]  (4a^2 + c^2 - b^2  )
+  \biggl[ b^2 - c^2+ \frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr) \biggr]^2

 

~=

~
4 a^2 c^2 
+ \biggl[ \frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr) \biggr]  (4a^2 + c^2 - b^2  )
+ ( b^2 - c^2)  (4a^2 + c^2 - b^2  )

 

 

~
+  (b^2 - c^2)^2 + 2(b^2 - c^2) \biggl[\frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr)\biggr]
+ \biggl[\frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr)\biggr]^2

 

~=

~
4 a^2 c^2 
+ ( b^2 - c^2)  (4a^2 + c^2 - b^2  )
+  (b^2 - c^2)^2 
+ \biggl[ \frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr) \biggr] 
\biggl[ (4a^2 + c^2 - b^2  )+ 2(b^2 - c^2) \biggr]
+ \biggl[\frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr)\biggr]^2

 

~=

~
\biggl[\frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr)\biggr]^2
+ \biggl[ \frac{\zeta_3}{\Omega_3}\biggl( \frac{2 a^2 b^2}{a^2+b^2}\biggr) \biggr] 
(4a^2 + b^2 - c^2 ) 
+ 4 a^2 b^2

~\Rightarrow~~~ 0

~=

~
\biggl[ \biggl(\frac{\zeta_3}{\Omega_3} \biggr)^2 \frac{a^2 b^2}{(a^2+b^2)^2}\biggr]
+ \frac{1}{2}\biggl[ \frac{\zeta_3}{\Omega_3}\biggl( \frac{1}{a^2+b^2}\biggr) \biggr] 
(4a^2 + b^2 - c^2 ) 
+ 1 \, .

Now, in our discussion of Riemann S-Type ellipsoids, there is also a quadratic equation that governs the equilibrium frequency ratio, ~f \equiv \zeta_3/\Omega_3. It is, specifically,

~0

~=

~
\biggl[ \frac{a^2 b^2}{(a^2 + b^2)^2} \biggr] f^2 
+ \biggl[ \frac{2a^2 b^2 B_{12}}{c^2 A_3 - a^2 b^2 A_{12}} \biggr]\frac{f}{a^2 + b^2} + 1 \, .

[ EFE, §48, Eq. (35) ]

Notice that the first and third terms of this quadratic equation exactly match the first and third terms of the quadratic equation, which we have just derived, that governs the same frequency ratio in Riemann ellipsoids of Types I, II & III. Does the second term match? That is, is the coefficient of the linear term the same in both quadratic relations? Well, …

~ \frac{2a^2 b^2 B_{12}}{c^2 A_3 - a^2 b^2 A_{12}}

~=

~2a^2 b^2 \biggl[ c^2 A_3 + a^2 b^2 \biggl( \frac{A_1 - A_2}{a^2-b^2} \biggr)\biggr]^{-1} \biggl[A_2 + a^2\biggl( \frac{A_1 - A_2}{a^2-b^2} \biggr)\biggr]

 

~=

~2a^2 b^2 \biggl[ c^2 A_3(a^2 - b^2) + a^2 b^2 (A_1 - A_2) \biggr]^{-1} \biggl[a^2 A_1  - b^2 A_2\biggr] \, .

Even appreciating that we can make the substitution, ~A_3 = (2 - A_1 - A_2), I don't see any way that this coefficient expression can be manipulated to match the associated coefficient in the other expression, namely, ~(4a^2 + b^2 - c^2)/2.


This is a quadratic equation whose solution gives,

~4a^2 \cdot \frac{\zeta_2}{\Omega_2} \biggl[\frac{c^2 }{a^2 + c^2 }  \biggr]

~=

~
- (4a^2 + c^2 - b^2  ) \pm \biggl[ (4a^2 + c^2 - b^2  )^2 - 16a^2 c^2 \biggr]^{1 / 2} \, .

For the other frequency ratio we therefore find,

~ 
2\biggl\{ b^2 -c^2
+ \frac{\zeta_3}{\Omega_3}\biggl[ \frac{2 a^2 b^2}{a^2+b^2}\biggr]   \biggr\}

~=

~
2 \cdot \frac{\zeta_2}{\Omega_2}\biggl[ \frac{2 a^2 c^2}{a^2 + c^2 }\biggr]

 

~=

~
- (4a^2 + c^2 - b^2  ) \pm \biggl[ (4a^2 + c^2 - b^2  )^2 - 16a^2 c^2 \biggr]^{1 / 2}

~ \Rightarrow ~~~
4a^2 \cdot \frac{\zeta_3}{\Omega_3}\biggl[ \frac{b^2}{a^2+b^2}\biggr]

~=

~
- (4a^2  + b^2 -c^2)  \pm \biggl[ (4a^2 + c^2 - b^2  )^2 - 16a^2 c^2 \biggr]^{1 / 2}

 

SUMMARY:   Riemann Ellipsoids of Types I, II, & III

~\beta \equiv~ -~\frac{\zeta_2}{\Omega_2} \biggl[\frac{c^2 }{a^2 + c^2 }  \biggr]

~=

~
\frac{1}{4a^2}\biggl\{ (4a^2 -b^2 + c^2  ) \mp \biggl[ (4a^2 + c^2 - b^2  )^2 - 16a^2 c^2 \biggr]^{1 / 2} \biggr\} \, ;

[ EFE, Chapter 7, §47, Eq. (16) ]

~
\gamma \equiv~-~\frac{\zeta_3}{\Omega_3}\biggl[ \frac{b^2}{a^2+b^2}\biggr]

~=

~
\frac{1}{4a^2}\biggl\{ (4a^2  + b^2 -c^2)  \mp \biggl[ (4a^2 + c^2 - b^2  )^2 - 16a^2 c^2 \biggr]^{1 / 2} \biggr\} \, .

[ EFE, Chapter 7, §47, Eq. (17) ]

As is emphasized in EFE (Chapter 7, §47, p. 131) "… the signs in front of the radicals, in the two expressions, go together. Furthermore, "the two roots … correspond to the fact that, consistent with Dedekind's theorem, two states of internal motions are compatible with the same external figure."


As has also been pointed out in EFE (Chapter 7, §51, p. 158), from the steps that have led to the development and solution of the above pair of quadratic equations we can demonstrate that the following relations also hold:

~\beta^2 - 2\beta + \frac{c^2}{a^2} = \biggl[ \frac{c^2 - b^2}{2a^2}\biggr]\beta \, ,

       

~\gamma^2 -2\gamma + \frac{b^2}{a^2} = \biggl[ \frac{b^2 - c^2}{2a^2} \biggr]\gamma

~1 - 2\beta + \biggl(\frac{a^2}{c^2}\biggr)\beta^2

~=

~\biggl[ \frac{4a^2 - b^2 - 3c^2}{2c^2}\biggr]\beta \, ,

~1 - 2\gamma + \biggl(\frac{a^2}{b^2}\biggr)\gamma^2

~=

~\biggl[ \frac{4a^2 - c^2 - 3b^2}{2b^2}\biggr]\gamma \, .

[ EFE, Chapter 7, §51, Eqs. (161) - (163) ]

Constraints Due to Diagonal Elements

Next, to simplify manipulations, let's replace the frequency ratios by these newly defined — and known — parameters, ~\beta and ~\gamma, in the three diagonal-element expressions that are written out in our above Summary Table.


Indices Rewritten Diagonal-Element Expressions
~i ~j
~1 ~1

~\biggl[ \frac{3\cdot 5}{2^2\pi a b c\rho} \biggr] \Pi

~=

~
-~\biggl\{ 
( \Omega_2^2 + \Omega_3^2)  
+ 2  \biggl[ \frac{b^2}{b^2+a^2}\biggr] \Omega_3 \biggl[ - \frac{\Omega_3\gamma (a^2 + b^2)}{b^2} \biggr] 
+ 2  \biggl[ \frac{c^2}{c^2 + a^2}\biggr]\Omega_2 \biggl[ -  \frac{\Omega_2 \beta( a^2 + c^2)}{c^2} \biggr] 
~-~(2\pi G\rho) A_1 
\biggr\} a^2

 

 

~
- \biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \biggl[ - \frac{\Omega_3\gamma (a^2 + b^2)}{b^2} \biggr]^2 b^2
- \biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \biggl[ -  \frac{\Omega_2 \beta( a^2 + c^2)}{c^2} \biggr]^2  c^2

 

~=

~
\biggl\{ 
- \Omega_2^2 - \Omega_3^2  
+ 2 \Omega_3^2 \gamma 
+ 2  \Omega_2^2 \beta 
~+~(2\pi G\rho) A_1 
\biggr\} a^2 
- \biggl( \frac{a^4}{b^2}\biggr) \Omega_3^2\gamma^2  
- \biggl( \frac{a^4}{c^2}\biggr) \Omega_2^2 \beta^2

 

~=

~
\biggl\{ \Omega_2^2 \biggl[2  \beta - 1 - \biggl( \frac{a^2}{c^2}\biggr)  \beta^2 \biggr]
+ \Omega_3^2 \biggl[ 2  \gamma - 1  - \biggl( \frac{a^2}{b^2}\biggr)\gamma^2  \biggr]
~+~(2\pi G\rho) A_1 
\biggr\}a^2

[ EFE, Chapter 7, §51, Eq. (158) ]
~2 ~2

~\biggl[ \frac{3\cdot 5}{2^2\pi a b c \rho} \biggr]\Pi

~=

~
-~ \biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \biggl[ - \frac{\Omega_3\gamma (a^2 + b^2)}{b^2} \biggr]^2 a^2
- \biggl\{
\Omega_3^2  
+ 2 \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \Omega_3 \biggl[ - \frac{\Omega_3\gamma (a^2 + b^2)}{b^2} \biggr]  
~-~( 2\pi G \rho) A_2 
\biggr\}b^2

 

~=

~
-~\Omega_3^2 \gamma^2 a^2
- \Omega_3^2 b^2  
+ 2 a^2 \Omega_3^2 \gamma  
~+~( 2\pi G \rho) b^2A_2

 

~=

~
-~a^2 \Omega_3^2 \biggl[\gamma^2 - 2\gamma  
+ \biggl( \frac{b^2}{a^2}\biggr) \biggr]  
~+~( 2\pi G \rho) b^2A_2

[ EFE, Chapter 7, §51, Eq. (159) ]
~3 ~3

~\biggl[ \frac{3\cdot 5}{2^2\pi abc\rho} \biggr]\Pi

~=

~
- \biggl[ \frac{c^2}{c^2 + a^2}\biggr]^2 \biggl[ -  \frac{\Omega_2 \beta( a^2 + c^2)}{c^2} \biggr]^2  a^2
- \biggl\{
\Omega_2^2   + 2 \biggl[ \frac{a^2}{a^2+c^2}\biggr]\Omega_2 \biggl[ -  \frac{\Omega_2 \beta( a^2 + c^2)}{c^2} \biggr] 
- (2\pi G \rho)A_3 
\biggr\}c^2

 

~=

~
-  \Omega_2^2 \beta^2 a^2 
-\Omega_2^2c^2   + 2 a^2\Omega_2^2 \beta  
+ (2\pi G \rho)c^2 A_3

 

~=

~-~a^2\Omega_2^2\biggl[
\beta^2 - 2 \beta 
+ \biggl( \frac{c^2}{a^2}\biggr)    \biggr]
+ (2\pi G \rho)c^2 A_3

[ EFE, Chapter 7, §51, Eq. (160) ]


Using the ~(i, j) = (3, 3) element to preplace ~\Pi in the other two expressions, we obtain,

~0

~=

~
\Omega_2^2\biggl[
\beta^2 - 2 \beta 
+ \biggl( \frac{c^2}{a^2}\biggr)    \biggr]
+
\Omega_2^2 \biggl[2  \beta - 1 - \biggl( \frac{a^2}{c^2}\biggr)  \beta^2 \biggr]
+ \Omega_3^2 \biggl[ 2  \gamma - 1  - \biggl( \frac{a^2}{b^2}\biggr)\gamma^2  \biggr]
~+~2\pi G\rho \biggl[ A_1 -  \biggl(\frac{c^2}{a^2}\biggr)A_3 \biggr] \, ;

and,

~\Omega_2^2\biggl[
\beta^2 - 2 \beta 
+ \biggl( \frac{c^2}{a^2}\biggr)    \biggr]

~=

~
\Omega_3^2 \biggl[\gamma^2 - 2\gamma  
+ \biggl( \frac{b^2}{a^2}\biggr) \biggr]  
~+~2\pi G \rho \biggl[\biggl( \frac{c^2}{a^2}\biggr) A_3 -  \biggl( \frac{b^2}{a^2} \biggr)A_2 \biggr] \, .

Inserting the various relations highlighted above, these two expressions may be rewritten as,

~0

~=

~
\Omega_2^2
\biggl[ \frac{c^2 - b^2}{2a^2}\biggr]\beta 
~-~\Omega_2^2 \biggl[ \frac{4a^2 - b^2 - 3c^2}{2c^2}\biggr]\beta
~-~\Omega_3^2 \biggl[ \frac{4a^2 - c^2 - 3b^2}{2b^2}\biggr]\gamma
~+~2\pi G\rho \biggl[ A_1 -  \biggl(\frac{c^2}{a^2}\biggr)A_3 \biggr]

 

~=

~
\Omega_2^2\beta
\biggl[ \frac{c^2(c^2 - b^2) + a^2 (b^2 + 3c^2 - 4a^2)}{2a^2c^2}
\biggr]
~-~\Omega_3^2 \gamma \biggl[ \frac{4a^2 - c^2 - 3b^2}{2b^2}\biggr]
~+~2\pi G\rho \biggl[ A_1 -  \biggl(\frac{c^2}{a^2}\biggr)A_3 \biggr] \, ;

and,

~\Omega_2^2
\biggl[ \frac{c^2 - b^2}{2a^2}\biggr]\beta

~=

~
\Omega_3^2 
\biggl[ \frac{b^2 - c^2}{2a^2} \biggr]\gamma~+~2\pi G \rho \biggl[\biggl( \frac{c^2}{a^2}\biggr) A_3 -  \biggl( \frac{b^2}{a^2} \biggr)A_2 \biggr]

~\Rightarrow ~~~ \Omega_2^2 \beta

~=

~
 ~-~\Omega_3^2 \gamma
~+~4\pi G \rho \biggl[ \frac{ c^2 A_3 -  b^2 A_2}{c^2 - b^2} \biggr]

~\Rightarrow ~~~ -~\Omega_3^2 \gamma

~=

~
\Omega_2^2 \beta~-~4\pi G \rho \biggl[ \frac{ c^2 A_3 -  b^2 A_2}{c^2 - b^2} \biggr] \, .

Together, then,

~0

~=

~
\Omega_2^2\beta
\biggl[ \frac{c^2(c^2 - b^2) + a^2 (b^2 + 3c^2 - 4a^2)}{2a^2c^2}
\biggr]
~+~2\pi G\rho \biggl[ A_1 -  \biggl(\frac{c^2}{a^2}\biggr)A_3 \biggr] 
~+~\biggl[ \frac{4a^2 - c^2 - 3b^2}{2b^2}\biggr]\biggl\{
\Omega_2^2 \beta~-~4\pi G \rho \biggl[ \frac{ c^2 A_3 -  b^2 A_2}{c^2 - b^2} \biggr] 
\biggr\}

 

~=

~
\Omega_2^2\beta
\biggl[ \frac{c^2(c^2 - b^2) + a^2 (b^2 + 3c^2 - 4a^2)}{2a^2c^2}
~+~\frac{4a^2 - c^2 - 3b^2}{2b^2}\biggr]
~+~2\pi G\rho \biggl[ \frac{a^2A_1 - c^2 A_3}{a^2} \biggr]
~-~2\pi G \rho \biggl[ \frac{4a^2 - c^2 - 3b^2}{b^2}\biggr] 
\biggl[ \frac{ c^2 A_3 -  b^2 A_2}{c^2 - b^2} \biggr]

 

~=

~
\Omega_2^2\beta
\biggl\{ \frac{b^2[ c^2(c^2 - b^2) + a^2 (b^2 + 3c^2 - 4a^2)] + (4a^2 - c^2 - 3b^2)a^2 c^2}{2a^2 b^2 c^2}
\biggr\}
~+~2\pi G\rho \biggl\{
\biggl[ \frac{a^2A_1 - c^2 A_3}{a^2} \biggr]
~-~\biggl[ \frac{4a^2 - c^2 - 3b^2}{b^2}\biggr] 
\biggl[ \frac{ c^2 A_3 -  b^2 A_2}{c^2 - b^2} \biggr] 
\biggr\}

 

~=

~
\Omega_2^2\beta
\biggl\{ \frac{b^2 c^2(c^2 - b^2) + a^2 b^2(c^2 - b^2 ) + ( c^2 - b^2)a^2 c^2 + a^2 (4a^2 -2b^2 - 2c^2 )(c^2 - b^2 ) }{2a^2 b^2 c^2}
\biggr\}
~+~2\pi G\rho 
\biggl[ \frac{b^2(a^2A_1 - c^2 A_3) + a^2(3b^2-4a^2 + c^2)B_{23} }{a^2b^2} \biggr]

 

~=

~
\Omega_2^2\beta \biggl[ \frac{c^2 - b^2}{c^2} \biggr]
\biggl[ \frac{ 4a^4 - a^2 (b^2 + c^2) + b^2 c^2  }{2a^2 b^2 }
\biggr]
~+~2\pi G\rho 
\biggl[ \frac{a^2(3b^2-4a^2 + c^2)B_{23} + b^2(a^2A_1 - c^2 A_3)  }{a^2b^2} \biggr] \, ,

[ EFE, Chapter 7, §51, Eq. (170) ]

where,

~B_{23}

~=

~\biggl[ \frac{A_2 b^2 - A_3 c^2}{b^2 - c^2} \biggr] \, .

[ EFE, Chapter 3, §21, Eqs. (105) & (107) ]

Similarly, given that (see just above),

~\Omega_2^2 \beta \biggl[ \frac{c^2 - b^2}{c^2} \biggr]

~=

~
-~\Omega_3^2 \gamma \biggl[ \frac{c^2 - b^2}{c^2} \biggr]
~+~4\pi G \rho \biggl[ \frac{ c^2 A_3 -  b^2 A_2}{c^2 } \biggr]

 

~=

~
-~\Omega_3^2 \gamma \biggl[ \frac{c^2 - b^2}{c^2} \biggr]
~+~4\pi G \rho \biggl[ \frac{ (c^2 -  b^2)B_{23} }{c^2 } \biggr] \, ,

we have,

~0

~=

~
\biggl\{
-~\Omega_3^2 \gamma \biggl[ \frac{c^2 - b^2}{c^2} \biggr]
~+~4\pi G \rho \biggl[ \frac{ (c^2 -  b^2)B_{23} }{c^2 } \biggr] 
\biggr\}
\biggl[ \frac{ 4a^4 - a^2 (b^2 + c^2) + b^2 c^2  }{2a^2 b^2 }
\biggr]
~+~2\pi G\rho 
\biggl[ \frac{a^2(3b^2-4a^2 + c^2)B_{23} + b^2(a^2A_1 - c^2 A_3)  }{a^2b^2} \biggr]

 

~=

~
-~\Omega_3^2 \gamma \biggl[ \frac{c^2 - b^2}{b^2} \biggr]
\biggl[ \frac{ 4a^4 - a^2 (b^2 + c^2) + b^2 c^2  }{2a^2 c^2 }
\biggr]
~+~2\pi G \rho \biggl\{
\biggl[ \frac{ [4a^4 - a^2 (b^2 + c^2) + b^2 c^2 ](c^2 -  b^2)B_{23}  }{a^2 b^2 c^2 }
\biggr]
~+~ 
\biggl[ \frac{a^2c^2 (3b^2-4a^2 + c^2)B_{23} + b^2c^2(a^2A_1 - c^2 A_3)  }{a^2b^2 c^2} \biggr] 
\biggr\}

 

~=

~
-~\Omega_3^2 \gamma \biggl[ \frac{c^2 - b^2}{b^2} \biggr]
\biggl[ \frac{ 4a^4 - a^2 (b^2 + c^2) + b^2 c^2  }{2a^2 c^2 }
\biggr]
~+~2\pi G \rho 
\biggl[ \frac{ a^2( b^2 + 3c^2 - 4a^2 ) B_{23} +c^2(a^2A_1 - b^2 A_2)  }{a^2 c^2 }
\biggr] \, .

[ EFE, Chapter 7, §51, Eq. (171) ]

Finally, looking back at the ~(i, j) = (3, 3) constraint and recognizing that,

~-~
\Omega_2^2\beta (c^2 - b^2)

~=

~
4\pi G\rho c^2
\biggl[ \frac{a^2(3b^2-4a^2 + c^2)B_{23} + b^2(a^2A_1 - c^2 A_3)  }{ 4a^4 - a^2 (b^2 + c^2) + b^2 c^2  } \biggr] \, ,

we find,

~2\biggl[ \frac{3\cdot 5}{2^2\pi abc\rho} \biggr]\Pi

~=

~-~2a^2\Omega_2^2\biggl[
\beta^2 - 2 \beta 
+ \biggl( \frac{c^2}{a^2}\biggr)    \biggr]
+ (4\pi G \rho)c^2 A_3

 

~=

~
(4\pi G \rho)c^2 A_3  
-~
(c^2 - b^2 )\Omega_2^2 \beta

 

~=

~
(4\pi G \rho)c^2 A_3  
+~
4\pi G\rho c^2
\biggl[ \frac{a^2(3b^2-4a^2 + c^2)B_{23} + b^2(a^2A_1 - c^2 A_3)  }{ 4a^4 - a^2 (b^2 + c^2) + b^2 c^2  } \biggr]

 

~=

~
4\pi G \rho c^2 \biggl\{ A_3  
+~
\biggl[ \frac{a^2(3b^2-4a^2 + c^2)B_{23} + b^2(a^2A_1 - c^2 A_3)  }{ 4a^4 - a^2 (b^2 + c^2) + b^2 c^2  } \biggr] 
\biggr\} \, .

Riemann S-Type Ellipsoids

In this case, we assume that ~\vec{\Omega} and ~\vec\zeta are aligned with each other and, as well, are aligned with the ~z-axis; that is to say, in addition to setting ~(\Omega_1, \zeta_1) = (0, 0) we also set ~(\Omega_2, \zeta_2) = (0, 0). So, there are only three unknowns — ~\Pi, (\Omega_3, \zeta_3) — and they can be determined by ignoring off-axis expressions and simultaneously solving the diagonal element expressions displayed in our above Summary Table. Furthermore, two of the three diagonal-element expressions can be simplified because we are setting ~(\Omega_2, \zeta_2) = (0, 0). The three relevant equilibrium constraints are:


Indices 2nd-Order TVE Expressions that are Relevant to Riemann S-Type Ellipsoids
~i ~j
~1 ~1

~0

~=

~
\biggl[ \frac{3\cdot 5}{2^2\pi a b c\rho} \biggr] \Pi
+\biggl\{ 
\Omega_3^2
+ 2  \biggl[ \frac{b^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3 
~-~(2\pi G\rho) A_1 
\biggr\} a^2 
+ \biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 b^2

~2 ~2

~0

~=

~
\biggl[ \frac{3\cdot 5}{2^2\pi a b c \rho} \biggr]\Pi
+ \biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \zeta_3^2 a^2
+ \biggl\{
\Omega_3^2  
+ 2 \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3  
~-~( 2\pi G \rho) A_2 
\biggr\}b^2

~3 ~3

~0

~=

~
\biggl[ \frac{3\cdot 5}{2^2\pi abc\rho} \biggr]\Pi
- (2\pi G \rho)A_3 c^2


The ~(i, j) = (3, 3) component expression immediately identifies the value of one of the unknowns, namely,

~\Pi

~=

~
\biggl( \frac{2^3\pi^2}{3\cdot 5} \biggr) G \rho^2A_3 a b c^3 \, .

From the remaining pair of diagonal-element expressions, we therefore have,

~
0

~=

~
a^2 \Omega_3^2
+ 2  \biggl[ \frac{b^2a^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3 
+ \biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 b^2
~+~(2\pi G\rho)(A_3 c^2 - A_1  a^2 ) \, ,

and,

~
0

~=

~
\biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \zeta_3^2 a^2
+ 
b^2 \Omega_3^2  
+ 2 \biggl[ \frac{a^2b^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3  
~+~( 2\pi G \rho)(A_3 c^2 - A_2 b^2) \, .

Multiplying the first of these two expressions through by ~b^2 and the second through by ~a^2, then subtracting the second from the first gives,

~0

~=

~
b^2\biggl\{ 
2  \biggl[ \frac{b^2a^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3 
+ \biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 b^2
~+~(2\pi G\rho)(A_3 c^2 - A_1  a^2 ) \biggr\}

 

 

~
-~
a^2\biggl\{
\biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \zeta_3^2 a^2
+ 2 \biggl[ \frac{a^2b^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3  
~+~( 2\pi G \rho)(A_3 c^2 - A_2 b^2) 
\biggr\}

 

~=

~
\biggl\{ 
2  \biggl[ \frac{b^4 a^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3 
~+~(2\pi G\rho)(A_3 c^2 - A_1  a^2 )b^2 \biggr\}
~-~
\biggl\{
2 \biggl[ \frac{a^4 b^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3  
~+~( 2\pi G \rho)(A_3 c^2 - A_2 b^2) a^2
\biggr\}

~\Rightarrow ~~~ \biggl[ \frac{b^2 a^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3

~=

~
\pi G\rho \biggl[ \frac{(A_3 c^2 - A_2 b^2) a^2 ~-~(A_3 c^2 - A_1  a^2 )b^2}{ b^2 - a^2} \biggr]

 

~=

~
\pi G\rho \biggl[ \frac{(A_1 - A_2)a^2b^2}{ b^2 - a^2} - A_3 c^2\biggr] \, .

[ EFE, Chapter 7, §48, Eq. (30) ]

Note that — as EFE has done and as we have recorded in a related discussion — the first term on the right-hand-side of this last expression can be expressed more compactly in terms of the coefficient, ~A_{12}.

Alternatively, dividing the first expression through by ~a^2 and the second by ~b^2, then adding the pair of expressions gives,

~
0

~=

~
\Omega_3^2
+ 2  \biggl[ \frac{b^2}{b^2+a^2}\biggr] \Omega_3 \zeta_3 
+ \biggl[ \frac{a^2b^2}{(a^2 + b^2)^2}\biggr] \zeta_3^2 
~+~(2\pi G\rho)(A_3 c^2 - A_1  a^2 )\frac{1}{a^2}

 

 

~+~
\biggl[ \frac{a^2 b^2}{(b^2+a^2)^2}\biggr] \zeta_3^2 
+ 
\Omega_3^2  
+ 2 \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \Omega_3 \zeta_3  
~+~( 2\pi G \rho)(A_3 c^2 - A_2 b^2) \frac{1}{b^2}

 

~=

~
2\Omega_3^2 + 2   \Omega_3 \zeta_3 
+ 2\biggl[ \frac{a^2b^2}{(a^2 + b^2)^2}\biggr] \zeta_3^2 
~+~2\pi G\rho \biggl[ \frac{A_3 c^2 - A_1  a^2 }{a^2} + \frac{A_3c^2 - A_2 b^2}{b^2}\biggr] \, .

If we divide through by 2, then replace the product, ~\Omega_3\zeta_3, in this expression by the relation derived immediately above, we have,

~
\Omega_3^2  
+ \biggl[ \frac{a^2b^2}{(a^2 + b^2)^2}\biggr] \zeta_3^2

~=

~
~-~\pi G\rho \biggl[ \frac{b^2 (A_3 c^2 - A_1  a^2) + a^2(A_3c^2 - A_2 b^2 ) }{a^2b^2} \biggr] 
~-~   
\pi G\rho \biggl[ \frac{(A_1 - A_2)a^2b^2 - A_3 c^2(b^2 - a^2)}{ b^2 - a^2} \biggr]\biggl[ \frac{b^2+a^2}{b^2 a^2}\biggr]

 

~=

~
\frac{\pi G\rho}{ a^2b^2(a^2-b^2) } 
\biggl\{ [ b^2 (A_3 c^2 - A_1  a^2) + a^2(A_3c^2 - A_2 b^2 )](b^2-a^2) 
~+~   
[ (A_1 - A_2)a^2b^2 - A_3 c^2(b^2 - a^2) ](b^2+a^2) 
\biggr\}

 

~=

~
\frac{\pi G\rho}{ a^2b^2(a^2-b^2) } 
\biggl\{ [  - A_1  a^2 b^2 - A_2 a^2 b^2 ](b^2-a^2) 
~+~   
(A_1 - A_2)a^2b^2 (b^2+a^2) 
\biggr\}

 

~=

~
\frac{2\pi G\rho}{ (a^2-b^2) } 
\biggl[ 
A_1   a^2 
- A_2  b^2 
\biggr] \, .

[ EFE, Chapter 7, §48, Eq. (29) ]

It has become customary to characterize each Riemann S-Type ellipsoid by the value of its equilibrium frequency ratio,

~f

~\equiv

~\frac{\zeta_3}{\Omega_3} \, ,

in which case the relevant pair of constraint equations becomes,

~\biggl[ \frac{b^2 a^2}{b^2+a^2}\biggr] f \Omega_3^2

~=

~
\pi G\rho \biggl[ \frac{(A_1 - A_2)a^2b^2}{ b^2 - a^2} - A_3 c^2\biggr] \, ;

[ EFE, Chapter 7, §48, Eq. (34) ]

and,

~
\Omega_3^2 \biggl\{1
+ \biggl[ \frac{a^2b^2}{(a^2 + b^2)^2}\biggr] f^2 \biggr\}

~=

~
\frac{2\pi G\rho}{ (a^2-b^2) } 
\biggl[ 
A_1   a^2 
- A_2  b^2 
\biggr] \, .

[ EFE, Chapter 7, §48, Eq. (33) ]

These two equations can straightforwardly be combined to generate a quadratic equation for the frequency ratio, ~f. Then, once the value of ~f has been determined, either expression can be used to determine the corresponding equilibrium value for ~\Omega_3 in the unit of ~(\pi G \rho)^{1 / 2}. The fact that the value of ~f is determined from the solution of a quadratic equation underscores the realization that, for a given specification of the ellipsoidal geometry ~(a, b, c), if an equilibrium exists — i.e., if the solution for ~f is real rather than imaginary — then two equally valid, and usually different (i.e., non-degenerate), values of ~f will be realized. This means that two different underlying flows — one direct and the other adjoint — will sustain the shape of the ellipsoidal configuration, as viewed from a frame that is rotating about the ~z-axis with frequency, ~\Omega_3.

Jacobi and Dedekind Ellipsoids

Describe …

Maclaurin Spheroids

Describe …

Appendices:  Various Integrals Over Ellipsoid Volume

Throughout this set of appendices, we work with a uniform-density ellipsoid whose surface is defined by the expression,

~1

~=

~
\frac{x^2}{a^2} + \frac{y^2}{b^2} + \frac{z^2}{c^2} \, .

Appendix A:  Volume

Here we seek to find the volume of the ellipsoid via the Cartesian integral expression,

~V

~=

~
\iiint  dx ~dy ~dz \, .

Preliminaries

First, we will integrate over ~x and specify the integration limits via the expression,

~x_\ell

~\equiv

~
a\biggl[ 1 - \frac{y^2}{b^2} - \frac{z^2}{c^2} \biggr]^{1 / 2} \, ;

second, we will integrate over ~z and specify the integration limits via the expression,

~z_\ell

~\equiv

~
c\biggl[ 1 - \frac{y^2}{b^2} \biggr]^{1 / 2} \, ;

third, we will integrate over ~y and set the limits of integration as ~\pm b.

Carry Out the Integration

Following thestrategy that has just been outlined, we have,

~V

~=

~
\iint  dy ~dz \int_{-x_\ell}^{+x_\ell} dx
=
\iint  dy ~dz \biggl[ x \biggr]_{-x_\ell}^{+x_\ell}
= 
2\int dy \int x_\ell ~dz

 

~=

~
2a\int dy \int \biggl[ 1 - \frac{y^2}{b^2} - \frac{z^2}{c^2} \biggr]^{1 / 2} dz
=
\frac{2a}{c} \int dy \int_{-z_\ell}^{+z_\ell} \biggl[ z_\ell^2- z^2 \biggr]^{1 / 2} dz

 

~=

~
\frac{2a}{c} \int \frac{dy}{2}  \biggl[ z\sqrt{ z_\ell^2- z^2 } + z_\ell^2 \sin^{-1} \biggl( \frac{z}{|z_\ell |} \biggr) \biggr]_{-z_\ell}^{+z_\ell}

 

~=

~
\frac{2a}{c} \int \biggl[ z_\ell \cancelto{0}{\sqrt{ z_\ell^2- z_\ell^2 }} + z_\ell^2 \sin^{-1} \biggl(1\biggr) \biggr] dy
=
\frac{2a}{c} \int \biggl[ \frac{\pi}{2} z_\ell^2 \biggr] dy

 

~=

~
\pi a c \int_{-b}^{+b} \biggl( 1 - \frac{y^2}{b^2} \biggr)  dy
=
\pi a c  \biggl[ y - \frac{y^3}{3b^2}  \biggr]_{-b}^{+b}

 

~=

~
\frac{4\pi}{3} \cdot a b c\, .

Appendix B:  Coriolis Component u1x2

~\iiint  [u_1 y] ~dx ~dy ~dz

~=

~
\iiint \biggl\{ - \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \zeta_3 y + \biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 z \biggr\} y ~dx ~dy ~dz

 

~=

~
- \biggl[ \frac{a^2}{a^2 + b^2}\biggr]\zeta_3 \iiint y^2 ~dx ~dy ~dz
+
 \biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 \iiint yz ~dx ~dy ~dz

 

~=

~
- \biggl[ \frac{a^2}{a^2 + b^2}\biggr]\zeta_3 \int y^2 dy \int dz \int_{-x_\ell}^{+x_\ell} dx 
+
 \biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 \int y ~dy \int z ~dz \int_{-x_\ell}^{+x_\ell} dx

 

~=

~
- \biggl[ \frac{2a^2}{a^2 + b^2}\biggr]\zeta_3 \int y^2 dy \int x_\ell dz  
+
 \biggl[ \frac{2a^2}{a^2+c^2}\biggr] \zeta_2 \int y ~dy \int z~x_\ell ~dz

 

~=

~
- \biggl[ \frac{2a^3}{a^2 + b^2}\biggr]\zeta_3 \int y^2 dy \int \biggl[ 1 - \frac{y^2}{b^2} - \frac{z^2}{c^2} \biggr]^{1 / 2} dz  
+
 \biggl[ \frac{2a^3}{a^2+c^2}\biggr] \zeta_2 \int y ~dy \int z~\biggl[ 1 - \frac{y^2}{b^2} - \frac{z^2}{c^2} \biggr]^{1 / 2} ~dz

 

~=

~
- \frac{1}{c}\biggl[ \frac{2a^3}{a^2 + b^2}\biggr]\zeta_3 \int y^2 dy \int_{-z_\ell}^{+z_\ell} \biggl[ z_\ell^2- z^2 \biggr]^{1 / 2} dz  
~+~
\frac{1}{c} \biggl[ \frac{2a^3}{a^2+c^2}\biggr] \zeta_2 \int y ~dy \int_{-z_\ell}^{+z_\ell} z~\biggl[ z_\ell^2 - z^2 \biggr]^{1 / 2} ~dz

 

~=

~
- \frac{1}{c}\biggl[ \frac{2a^3}{a^2 + b^2}\biggr]\zeta_3 \int y^2 dy \cdot \frac{1}{2} \biggl\{ z \sqrt{z_\ell^2 - z^2} + z_\ell^2 \sin^{-1}\biggl(\frac{z}{|z_\ell |}\biggr) \biggr\}_{-z_\ell}^{+z_\ell}  
~-~
\frac{1}{c} \biggl[ \frac{2a^3}{a^2+c^2}\biggr] \zeta_2 \int y ~dy \cdot \frac{1}{3} \biggl\{ \biggl[ z_\ell^2 - z^2 \biggr]^{3 / 2} \biggr\}_{-z_\ell}^{+z_\ell}

 

~=

~
- \frac{1}{c}\biggl[ \frac{2a^3}{a^2 + b^2}\biggr]\zeta_3 \int y^2 dy \cdot \frac{1}{2} \biggl\{ z_\ell^2 \sin^{-1}\biggl(\frac{z}{|z_\ell |}\biggr) \biggr\}_{-z_\ell}^{+z_\ell}  
=
- \pi a~c\biggl[ \frac{a^2}{a^2 + b^2}\biggr]\zeta_3 \int_{-b}^b y^2 \biggl[1 - \frac{y^2}{b^2}  \biggr] dy

 

~=

~
- \pi ac\biggl[ \frac{a^2}{a^2 + b^2}\biggr]\zeta_3 \biggl[\frac{y^3}{3} - \frac{y^5}{5b^2}  \biggr]_{-b}^{+b}  
=
- 2\pi a b^3 c\biggl[ \frac{a^2}{a^2 + b^2}\biggr]\zeta_3 \biggl[\frac{2}{15}  \biggr]  
=
- \frac{4\pi abc}{3} \biggl[ \frac{a^2}{a^2 + b^2}\biggr]\zeta_3 \biggl[\frac{b^2}{5}  \biggr]

 

~=

~
- \frac{I_{22}}{\rho} \biggl[ \frac{a^2}{a^2 + b^2}\biggr]\zeta_3   \, .

[ EFE, Chapter 7, §47, p. 130, Eq. (9a) ]

Appendix C:  Coriolis Component u1x3

Here we will additionally make use of the integration limits,

~y_\ell^2

~\equiv

~b^2 \biggl(1 - \frac{z^2}{c^2}\biggr) \, .

Integration over the relevant Coriolis component gives,

~\iiint  [u_1 z] ~dx ~dy ~dz

~=

~
\iiint \biggl\{ - \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \zeta_3 y + \biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 z \biggr\} z ~dx ~dy ~dz

 

~=

~-
\biggl[ \frac{a^2}{a^2 + b^2}\biggr] \zeta_3\iiint \cancelto{0}{y  z ~dx ~dy ~dz}
+
\biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 \iiint  z^2 ~dx ~dy ~dz

 

~=

~
\biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 \int z^2 dz \int dy \int_{-x_\ell}^{+x_\ell} dx

 

~=

~
2a\biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 \int z^2 dz \int dy \biggl\{ \biggl[ 1 - \frac{y^2}{b^2} - \frac{z^2}{c^2} \biggr]^{1 / 2} \biggr\}

 

~=

~
\frac{2a}{b}\biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 \int z^2 dz \int_{-y_\ell}^{+y_\ell} \biggl[ y_\ell^2 - y^2 \biggr]^{1 / 2} dy

 

~=

~
\frac{2a}{b}\biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 \int z^2 dz \cdot \frac{1}{2}\biggl\{ y \sqrt{y_\ell^2 - y^2} + y_\ell^2 \sin^{-1}\biggr( \frac{y}{|y_\ell |} \biggr)\biggr\}_{-y_\ell}^{+y_\ell}

 

~=

~
\frac{2a}{b}\biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 \int_{-c}^c z^2  \biggl\{ \frac{\pi}{2} y_\ell^2 \biggr\} dz
=
\pi a b \biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 \int_{-c}^c z^2  \biggl\{ 1 - \frac{z^2}{c^2} \biggr\} dz

 

~=

~
\pi a b \biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 \biggl\{\frac{z^3}{3} - \frac{z^5}{5c^2} \biggr\}_{-c}^{+c}
=
\pi a b \biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 \biggl\{\frac{1}{3} - \frac{1}{5} \biggr\}2c^3
=
\frac{4 \pi a b c}{3}\biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 \biggl\{\frac{c^2}{5} \biggr\}

 

~=

~+
~\frac{I_{33}}{\rho} \biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 \, .

[ EFE, Chapter 7, §47, p. 130, Eq. (9b) ]


Appendix D:   The Other Four Coriolis Components

It follows that,

~\iiint  [u_2 x] ~dx ~dy ~dz

~=

~
\iiint \biggl\{ - \cancelto{0}{\biggl[ \frac{a_2^2}{a_2^2 + a_3^2}\biggr] \zeta_1 z} + \biggl[ \frac{a_2^2}{a_2^2+a_1^2}\biggr] \zeta_3 x \biggr\} x ~dx ~dy ~dz

 

~=

~
+~\frac{I_{11}}{\rho}\biggl[ \frac{b^2}{b^2+a^2}\biggr] \zeta_3 \, ;

~\iiint  [u_2 z] ~dx ~dy ~dz

~=

~
\iiint \biggl\{ - \biggl[ \frac{a_2^2}{a_2^2 + a_3^2}\biggr] \zeta_1 z + \cancelto{0}{\biggl[ \frac{a_2^2}{a_2^2+a_1^2}\biggr] \zeta_3 x} \biggr\} z ~dx ~dy ~dz

 

~=

~
-~\frac{I_{33}}{\rho} \biggl[\frac{b^2}{b^2 + c^2}\biggr] \zeta_1 \, ;

~\iiint  [u_3 x] ~dx ~dy ~dz

~=

~
\iiint \biggl\{ - \biggl[ \frac{a_3^2}{a_3^2 + a_1^2}\biggr] \zeta_2 x + \cancelto{0}{\biggl[ \frac{a_3^2}{a_3^2+a_2^2}\biggr] \zeta_1 y} \biggr\} x ~dx ~dy ~dz

 

~=

~
-~\frac{I_{11}}{\rho} \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 \, ;

~\iiint  [u_3 y] ~dx ~dy ~dz

~=

~
\iiint \biggl\{ - \cancelto{0}{\biggl[ \frac{a_3^2}{a_3^2 + a_1^2}\biggr] \zeta_2 x} + \biggl[ \frac{a_3^2}{a_3^2+a_2^2}\biggr] \zeta_1 y \biggr\} y ~dx ~dy ~dz

 

~=

~
+~\frac{I_{22}}{\rho} \biggl[ \frac{c^2}{c^2+b^2}\biggr] \zeta_1  \, .

Appendix E:   Kinetic Energy Components

Diagonal Elements

~\biggl( \frac{2}{\rho}\biggr)\mathfrak{T}_{11} = \int_V  u_1 u_1 d^3x

~=

~\iiint  [u_1^2] ~dx ~dy ~dz

 

~=

~\iiint  \biggl\{ - \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \zeta_3 y + \biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 z \biggr\}^2 ~dx ~dy ~dz

 

~=

~\iiint  \biggl\{
\biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 y^2 
- 2\cancelto{0}{\biggl[ \frac{a^2}{a^2 + b^2}\biggr]  
\biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 \zeta_3} yz 
+ \biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \zeta_2^2 z^2 
\biggr\} ~dx ~dy ~dz

 

~=

~
\biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 \iiint  y^2  ~dx ~dy ~dz
+
\biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \zeta_2^2\iiint z^2 ~dx ~dy ~dz

 

~=

~
\biggl[ \frac{a^2}{a^2 + b^2}\biggr]^2 \zeta_3^2 \biggl[ \frac{I_{22}}{\rho} \biggr]
+
\biggl[ \frac{a^2}{a^2+c^2}\biggr]^2 \zeta_2^2 \biggl[ \frac{I_{33}}{\rho} \biggr] \, .

Similarly,

~\biggl( \frac{2}{\rho}\biggr)\mathfrak{T}_{22} = \int_V  u_2 u_2 d^3x

~=

~\iiint  [u_2^2] ~dx ~dy ~dz

 

~=

~\iiint  \biggl\{ - \biggl[ \frac{b^2}{b^2 + c^2}\biggr] \zeta_1 z + \biggl[ \frac{b^2}{b^2+a^2}\biggr] \zeta_3 x  \biggr\}^2 ~dx ~dy ~dz

 

~=

~
\biggl[ \frac{b^2}{b^2 + c^2}\biggr]^2 \zeta_1^2  \biggl[ \frac{I_{33}}{\rho} \biggr]
+
\biggl[ \frac{b^2}{b^2+a^2}\biggr]^2 \zeta_3^2 \biggl[ \frac{I_{11}}{\rho} \biggr] \, ;

~\biggl( \frac{2}{\rho}\biggr)\mathfrak{T}_{33} = \int_V  u_3 u_3 d^3x

~=

~\iiint  [u_2^2] ~dx ~dy ~dz

 

~=

~\iiint  \biggl\{ - \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 x + \biggl[ \frac{c^2}{c^2+b^2}\biggr] \zeta_1 y \biggr\}^2 ~dx ~dy ~dz

 

~=

~
\biggl[ \frac{c^2}{c^2 + a^2}\biggr]^2 \zeta_2^2  \biggl[ \frac{I_{11}}{\rho} \biggr]
+
\biggl[ \frac{c^2}{c^2+b^2}\biggr]^2 \zeta_1^2 \biggl[ \frac{I_{22}}{\rho} \biggr] \, .

Off-Diagonal Elements

~\biggl( \frac{2}{\rho}\biggr)\mathfrak{T}_{23} = \int_V  u_2 u_3 d^3x

~=

~\iiint  [u_2 u_3] ~dx ~dy ~dz

 

~=

~\iiint  
\biggl\{ - \biggl[ \frac{b^2}{b^2 + c^2}\biggr] \zeta_1 z + \biggl[ \frac{b^2}{b^2+a^2}\biggr] \zeta_3 x\biggr\} 
\biggl\{ - \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 x + \biggl[ \frac{c^2}{c^2+b^2}\biggr] \zeta_1 y \biggr\} 
~dx ~dy ~dz

 

~=

~\iiint  
\biggl\{ - \biggl[ \frac{b^2}{b^2 + c^2}\biggr] \zeta_1 z \biggr\} 
\biggl\{ - \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 x + \biggl[ \frac{c^2}{c^2+b^2}\biggr] \zeta_1 y \biggr\} 
~dx ~dy ~dz

 

 

~+ \iiint
\biggl\{\biggl[ \frac{b^2}{b^2+a^2}\biggr] \zeta_3 x\biggr\} 
\biggl\{ - \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 x + \biggl[ \frac{c^2}{c^2+b^2}\biggr] \zeta_1 y \biggr\} 
~dx ~dy ~dz

 

~=

~-~\iiint
\biggl\{\biggl[ \frac{b^2}{b^2+a^2}\biggr]  \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 \zeta_3  \biggr\} 
x^2~dx ~dy ~dz

 

~=

~- ~\frac{I_{11}}{\rho}
\biggl[ \frac{b^2}{b^2+a^2}\biggr]  \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 \zeta_3

[ EFE, Chapter 7, §47, p. 130, Eq. (8) ]

Similarly,

~\biggl( \frac{2}{\rho}\biggr)\mathfrak{T}_{12} = \int_V  u_1 u_2 d^3x

~=

~\iiint  [u_1 u_2] ~dx ~dy ~dz

 

~=

~\iiint  
\biggl\{ - \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \zeta_3 y + \biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 z \biggr\} 
\biggl\{ - \biggl[ \frac{b^2}{b^2 + c^2}\biggr] \zeta_1 z + \biggl[ \frac{b^2}{b^2+a^2}\biggr] \zeta_3 x \biggr\} 
~dx ~dy ~dz

 

~=

~-~  
\biggl[ \frac{a^2}{a^2+c^2}\biggr]  
\biggl[ \frac{b^2}{b^2 + c^2}\biggr] \zeta_1 \zeta_2  
\iiint z^2~dx ~dy ~dz

 

~=

~-~  \frac{I_{33}}{\rho}
\biggl[ \frac{a^2}{a^2+c^2}\biggr]  
\biggl[ \frac{b^2}{b^2 + c^2}\biggr] \zeta_1 \zeta_2  
\, ;

~\biggl( \frac{2}{\rho}\biggr)\mathfrak{T}_{31} = \int_V  u_3 u_1 d^3x

~=

~\iiint  [u_3 u_1] ~dx ~dy ~dz

 

~=

~\iiint  
\biggl\{ - \biggl[ \frac{c^2}{c^2 + a^2}\biggr] \zeta_2 x + \biggl[ \frac{c^2}{c^2+b^2}\biggr] \zeta_1 y \biggr\} 
\biggl\{ - \biggl[ \frac{a^2}{a^2 + b^2}\biggr] \zeta_3 y + \biggl[ \frac{a^2}{a^2+c^2}\biggr] \zeta_2 z \biggr\} 
~dx ~dy ~dz

 

~=

~ -~ 
\biggl[ \frac{c^2}{c^2+b^2}\biggr]  
\biggl[ \frac{a^2}{a^2 + b^2}\biggr] \zeta_1\zeta_3  
\iiint y^2~dx ~dy ~dz

 

~=

~ -~ \frac{I_{22}}{\rho}
\biggl[ \frac{c^2}{c^2+b^2}\biggr]  
\biggl[ \frac{a^2}{a^2 + b^2}\biggr] \zeta_1\zeta_3  \, .

And, finally,

~\mathfrak{T}_{32}

~=

~\mathfrak{T}_{23} \, ;

     

~\mathfrak{T}_{21}

~=

~\mathfrak{T}_{12} \, ;

      and,     

~\mathfrak{T}_{13}

~=

~\mathfrak{T}_{31} \, .

See Also


Whitworth's (1981) Isothermal Free-Energy Surface

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