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In page Andrei Sakharov:

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In his first model the two universes did not interact, except via local matter accumulation whose density and pressure become high enough to connect the two sheets through a bridge without spacetime between them, but with a continuity of geodesics beyond the Schwarzschild radius with no singularity[citation needed], allowing an exchange of matter between the two conjugated sheets, based on an idea after Igor Dmitriyevich Novikov.[11] Novikov called such singularities a collapse and an anticollapse, which are an alternative to the couple black hole and white hole in the wormhole model. Sakharov also proposed the idea of induced gravity as an alternative theory of quantum gravity.[12]