This is discussed on reddit science
It's the latest in a series of papers exploring the idea that black holes and the big bang/inflation are actually the same phenomenon, just looked at from opposite sides of an event horizon.
The implication would be that the universe we know is simply a bubble holding matter pinched off from a larger universe and similarly black holes in our universe are exploding into universes of their own as they form.
It's very appealing asthetically, but these speculative theories don't have a great track record of holding up once they finally make testable predictions that can be measured.
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. For a typical stellar black hole, Mb is about 10^32 solar masses, which is 10^6 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.