Oppenheimer–Snyder model
Exact solution to the Einstein field equations / From Wikipedia, the free encyclopedia
In general relativity, the Oppenheimer–Snyder model is a solution to the Einstein field equations based on the Schwarzschild metric describing the collapse of an object of extreme mass into a black hole.[1] It is named after physicists J. Robert Oppenheimer and Hartland Snyder, who published it in 1939.[2]
During the collapse of a star to a black hole the geometry on the outside of the sphere is the Schwarzschild geometry. However the geometry inside is, curiously enough, the same Robertson-Walker geometry as in the rest of the observable universe.[3]