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In an analysis of the motion of particles entering a black hole, published in March, Nikodem Poplawski of Indiana University in Bloomington showed that inside each black hole there could exist another universe (Physics Letters B, DOI: 10.1016/j.physletb.2010.03.029). "Maybe the huge black holes at the centre of the Milky Way and other galaxies are bridges to different universes," Poplawski says. If that is correct - and it's a big "if" - there is nothing to rule out our universe itself being inside a black hole.
When the density of matter reaches gargantuan proportions (more than about 1050 kilograms per cubic metre) inside a black hole, torsion manifests itself as a force that counters gravity. This prevents matter compressing indefinitely to reach infinite density, so there is no singularity. Instead, says Poplawski, matter rebounds and starts expanding again
. The scenario resembles what happens when you compress a spring: Poplawski has calculated that gravity initially overcomes torsion's repulsive force and keeps compressing matter, but eventually the repulsive force gets so strong that the matter stops collapsing and rebounds.
Sadly, there is no point in us looking for other universes inside black holes. As you approach a black hole, the increasing gravitational field makes time tick slower and slower. So, for an external observer, any new universe inside would form only after an infinite amount of time had elapsed.