Has Anyone Solved Einstein's Unified Field Theory?

MJA
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Has anyone else found the solution to Einstein's Unified Field Theory equation?

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MJA
 
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What unified field theory equation of Einstein's?
 
Unified field theories were a topic Einstein worked on. He never succeeded in finding a unified field theory. To find such a theory, you have to (1) write down a conjectured field equation; (2) find various solutions to the equation, each representing a physical situation; and (3) see if they match up with experiment and make new predictions that can be tested. When we say that he didn't succeed, we mean that he did #1 and #2, but none of his attempts passed the test in #3.

-Ben
 

Thread 'Euclidean geometry and gravity'

I asked a question here, probably over 15 years ago on entanglement and I appreciated the thoughtful answers I received back then. The intervening years haven't made me any more knowledgeable in physics, so forgive my naïveté ! If a have a piece of paper in an area of high gravity, lets say near a black hole, and I draw a triangle on this paper and 'measure' the angles of the triangle, will they add to 180 degrees? How about if I'm looking at this paper outside of the (reasonable)...
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Thread 'Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?'

From $$0 = \delta(g^{\alpha\mu}g_{\mu\nu}) = g^{\alpha\mu} \delta g_{\mu\nu} + g_{\mu\nu} \delta g^{\alpha\mu}$$ we have $$g^{\alpha\mu} \delta g_{\mu\nu} = -g_{\mu\nu} \delta g^{\alpha\mu} \,\, . $$ Multiply both sides by ##g_{\alpha\beta}## to get $$\delta g_{\beta\nu} = -g_{\alpha\beta} g_{\mu\nu} \delta g^{\alpha\mu} \qquad(*)$$ (This is Dirac's eq. (26.9) in "GTR".) On the other hand, the variation ##\delta g^{\alpha\mu} = \bar{g}^{\alpha\mu} - g^{\alpha\mu}## should be a tensor...
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