Is The Big Bang a White Hole?
When people hear about the big bang theory they often ask “Where is its centre?” The standard answer is that it has no centre because it is expanding uniformly everywhere. In giving this answer cosmologists are forgetting about alternative models which Georges Lematre first discovered in 1927 when he developed Friedmann’s original work into the big bang theory. Lematre found solutions to the equations of general relativity which are centred on a point in space. They are inhomogeneous spherically symmetric models of the universe which have been rediscovered many times since, but they are rarely considered as plausible cosmological models on very large scales. The time reversal of Lematre’s models can also describe the formation of a black hole from a pressureless, spherically symmetrical, non-rotating cloud of dust. A particular case of this was studied by Oppenheimer and Snyder in 1939. A sphere of dust is uniform in density with empty space outside. The dust sphere collapses to form a
