I'm working on the premises that the Minkowski metric tensor is a purely electromagnetic phenomenon which originates from the physical structure of the electromagnetic wave-carrying medium.

As regards the Schwarzschild solution, this is about imposing spherical symmetry into the structure of this medium, about a point. The Einsteinian interpretation is that a source-mass warps the surrounding space. Newton's gravitational potential formula is substituted into a C/r term, where C is a constant of integration, as being the cause of the warping.

So, general relativity is simply the EM wave-carrying medium with a gravitational field superimposed on it. But why could we not then also have another version in which, instead of superimposing a gravitational field on the EM wave-carrying medium, we superimpose an electrostatic field?

It seems that doing so would clash with Einstein's vision in which general relativity combines electromagnetism and gravity into a single physical mechanism.

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