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# Solution to Einstein's Field Equations where T^uv not= 0?

## Solution to Einstein's Field Equations where T^uv not= 0? - Physics Forum

### Solution to Einstein's Field Equations where T^uv not= 0? - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.

#1
03-16-2006, 06:27 PM
 Jay R. Yablon Guest Posts: n/a
Solution to Einstein's Field Equations where T^uv not= 0?

Many of the widely-studied solutions to Einstein's field equations are taken
in vacuo, that is, at events where the energy momentum tensor T^uv=0. This
includes Schwarzchild and Kerr geometries, for example.

Have there been many exact solutions found where T^uv not= 0? I am speaking
of analytical solutions where the differential equations are solved exactly,
*not* numerical approximations.

I am especially interested in any exact solutions based on the usual Maxwell
energy tensor of electrodynamics T^u_v = (1/4pi) [F^ut F_vt - (1/4)
lambda^u_v F^st F_st]. I am interested in solutions both where F^uv_u=0
(free space) and also where F^uv_u=J^v (space with current sources).
Conditions of interest include static spherical symmetry in the nature of
Schwarzchild, and rotation with spherical symmetry about the z-axis in the
nature of Kerr.

To be clear, I am *not* looking for solutions where the metric is assumed to
be a Minkowski metric. Lots of analyses assume a flat-space background for
electrodynamics.

Rather, I am looking for *exact* solutions, to the extent that such
solutions are known, which derive a curved spacetime metric from the
electromagnetic field strength tensor, that is, which derive g_uv =
g_uv(F^uv) via the Maxwell tensor T^u_v, whereby T^u_v(g_uv, F_uv) simply
becomes T^u_v(F_uv) once the g_uv(F^uv) are found.

Thanks.

Jay R. Yablon

Email: [Only registered users see links. ]

#2
03-16-2006, 08:19 PM
 Martin Hogbin Guest Posts: n/a
Solution to Einstein's Field Equations where T^uv not= 0?

"Jay R. Yablon" <[Only registered users see links. ].com> wrote in message news:G_iSf.18215\$[Only registered users see links. ].com...

You might try posting this on sci.physics.research.

Martin Hogbin

#3
03-16-2006, 08:42 PM
 Jay R. Yablon Guest Posts: n/a
Solution to Einstein's Field Equations where T^uv not= 0?

> You might try posting this on sci.physics.research.

I sent it there three days ago, but nobody is minding the store right now.
Nothing new has posted there since Monday. I expect it will post there
soon.

Jay R. Yablon

#4
03-16-2006, 09:02 PM
 Ben Rudiak-Gould Guest Posts: n/a
Solution to Einstein's Field Equations where T^uv not= 0?

Wikipedia seems to have a pretty good section on this:

[Only registered users see links. ]

-- Ben
#5
03-16-2006, 09:35 PM
 Jay R. Yablon Guest Posts: n/a
Solution to Einstein's Field Equations where T^uv not= 0?

Jay.

--
_____________________________
Jay R. Yablon
Email: [Only registered users see links. ]
"Ben Rudiak-Gould" <[Only registered users see links. ].uk> wrote in message
news:dvcn9f\$jom\$[Only registered users see links. ].cam.ac.uk...

#6
03-16-2006, 10:02 PM
 carlip-nospam@physics.ucdavis.edu Guest Posts: n/a
Solution to Einstein's Field Equations where T^uv not= 0?

In sci.physics Ben Rudiak-Gould <[Only registered users see links. ].uk> wrote:

This looks pretty good. If you want more, the standard source is the
"exact solutions" book -- Stephani, Kramer, MacCallum, Hoenselaers,
and Herlt, _ Exact Solutions of Einstein's Field Equations_ (second
edition, 2003), Cambridge University Press. There's also an online
searchable database at [Only registered users see links. ]
but this requires that you know a bit about what you're looking for.

Steve Carlip

#7
03-16-2006, 10:09 PM
 Ken S. Tucker Guest Posts: n/a
Solution to Einstein's Field Equations where T^uv not= 0?

Ben Rudiak-Gould wrote:

Yes, that wiki on GR is quite good, given the
difficulty of the subject.
One can go to the Electrovacuum solution and
encounter the Rainich *issues*, but that doesn't
satisfy Jay's g_uv = g_uv(F_uv) question regarding
an exact solution.

There's more at,

[Only registered users see links. ]

which focuses on antisymmetrization to relate 4 and 5D.

In Tolman's "Relativity" book, pg.265 is the classical
treatment but that approach, as far as I know, has
been largely discredited because it depends on the
self energizing of a the fundamental charge, and that
effect is theoretically weak and not substantiated by
by any experiment, that I can find.

Hopefully someone else can provide an answer to
Jay's question, apart from,

[Only registered users see links. ]

which provides a sort of bench-mark to attack the
problem.

Regards
Ken S. Tucker

#8
03-16-2006, 11:15 PM
 Jay R. Yablon Guest Posts: n/a
Solution to Einstein's Field Equations where T^uv not= 0?

Thank you for the suggestion re the "exact solutions" book. I browsed it on
Amazon, and it is just what I am looking for, so I placed an order for it.

Jay R. Yablon

--
_____________________________
Jay R. Yablon
Email: [Only registered users see links. ]
<[Only registered users see links. ]> wrote in message
news:dvcqqr\$98b\$[Only registered users see links. ]...

#9
03-17-2006, 10:06 AM
 brian a m stuckless Guest Posts: n/a
Solution to Einstein's Field Equations where T^uv not= 0?

Jay R. Yablon wrote: >
\$\$ No.
\$\$ YABsolutely no.

--Jay R Yablon.

\$\$ Maxwell used REAL "flat" plates in air to derive his equations.
\$\$ This is why GR is only "approximately" flat, at-great-distance.
\$\$ Even a dot has extreme "curvature", so you can imagine a point.
\$\$ GR is a "point-SURFACE manifold" at the end of it's WORLD-line.
\$\$ This is why GR is NOT a "local" theory (where it's all Newton).
\$\$ This is why GR is a "far-field" theory (where it's all Newton).
\$\$ [ The "SURFACE" of a GR-"POiNT" is "FLAT-at-a-GREAT-distance ].
\$\$
\$\$ Tom R ought derive a set from lab work ..using "CURVED" plates.
\$\$ [Just let the PLATEs be M1 and m1 and the air as the "AEther"].
\$\$
\$\$ Hope this helps, ```Brian A M Stuckless, Ph.T (Tivity).
GR CUT OFF it's own WORLD-line, having DECLARED no PRiOR geometry.
p.s. A GR-"geodesic" is *NOT* Uncle Al's "OTHER LONGER way round".

Re: Solution to Einstein's Field Equations where T^uv not= 0?.

 Tags einstein , equations , field , solution , tuv

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