How does timecube have a wiki and my MCM doesn't? If you study the two different types of Randall-Sundrum models, you will see that the MCM is a just like a third configuration which they think of. Instead of doing AdS/CFT on the outer boundary of some bulk, I put the holographic surface squeezed between two bulks. This was my new idea: if you are doing the "holographic duality" between surfaces and bulks, pick a surface between two bulks instead of on the outside of one bulk.
In the 1920s, Kaluza almost found a way to unify EM and gravity in 5D but it didn't quite work because the only solutions required that the electromagnetic strength tensor should be identically zero everywhere. By going from a 4D metric to a 5D metric, he added nine new degrees of freedom. (16 matrix positions to 25.) One of these nine is the scalar field, or the de Sitter parameter, and the other 8 form a EM potential vector and and EM potential dual vector, each with four degrees of freedom. The remaining eight degrees were not enough freedom to unify real EM with gravity in Kaluza's model; it almost worked, but not quite. So I said, "If two EM potential vectors don't have enough freedom, let's take two 5D Kaluza theories and then solve physics on a 4D boundary which separates the two 5D spaces. With two 5D metrics, this makes two EM potential vectors, and two dual vectors, for 16 degrees of freedom (constrained by the total antisymmetry of the EM strength tensor obviously). This is enough freedom to have a non-zero EM strength tensor on the 4D boundary where the two 5D Kaluza spaces touch. No one noticed that, to my knowledge, between Kaluza in the 1920s and then me in 2013.
A lack of a solution for "classical electrogravity" is why we don't have UFOs and flying Jetsons cars yet. I solved the problem in 2013.
Geometric Cosmology
https://vixra.org/abs/1301.0032 
