Is it different than the Einsteins theory of relativity?
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General Relativity is a set (a tensor) of differential equations.
A metric, such as the FRW metric, is used to evolve the GR tensor into a space with essentially no mass, just dust. You would use a Schwarzchild, Eddington, or Kruskal metric for a black hole.
A metric, such as the FRW metric, is used to evolve the GR tensor into a space with essentially no mass, just dust. You would use a Schwarzchild, Eddington, or Kruskal metric for a black hole.