Nikodem J. Poplawski
If spacetime torsion couples to the intrinsic spin of matter according to the Einstein-Cartan-Sciama-Kibble theory of gravity, then the resulting gravitational repulsion at supranuclear densities prevents the formation of singularities in black holes.
Consequently, the interior of every black hole becomes a new universe that expands from a nonsingular bounce. We consider gravitational collapse of fermionic spin-fluid matter with the stiff equation of state in a stellar black hole.
Such a collapse increases the mass of the matter, which occurs through the Parker-Zel’dovich-Starobinskii quantum particle production in strong, anisotropic gravitational fields. The subsequent pair annihilation changes the stiff matter into an ultrarelativistic fluid.
We show that the universe in a black hole of mass MBH at the bounce has a mass
Mb ~ MBH2 mn1/2 / mPl3/2
where mn is the mass of a neutron and mPl is the reduced Planck mass.
For a typical stellar black hole, Mb is about 1032 solar masses, which 106 larger than the mass of our Universe. As the relativistic black-hole universe expands, its mass decreases until the universe becomes dominated by nonrelativistic heavy particles…..
Read more: http://arxiv.org
Read also: http://arxiv.org2