Black hole cosmology

A black hole cosmology, or Schwarzschild cosmology, is a cosmological model in which the observable universe is the interior of a black hole.

During gravitational collapse of most massive stars and centers of galaxies, a black hole forms. The matter in a black hole continues to contract. It is speculated that at extremely high densities, much greater than the density of nuclear matter, torsion or another mechanism limiting curvature might prevent the matter from compressing indefinitely to a singularity. Instead, the collapsing matter reaches a state with an extremely large but finite density, stops collapsing, undergoes a bounce, and starts rapidly expanding.

According to such scenarios, our observable universe was born in a black hole existing in a larger universe, where this black hole may, at some point, appear as a white hole. Rather than a Big Bang starting from a singularity, there is instead a non-singular Big Bounce, at which the Universe had a non-zero, minimum scale factor. In some such models, all universes created by black holes form a multiverse.

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