Are there any theories that suggest that there are smaller degenerate states than the state reached in a neutron star? For example, is there a degenerate state for quarks? For strings? (should they exist) For theories that suggest such possibilities, do they discuss what would happen to the classical definition of a black hole? I imagine we would still have a black hole, but the center of the black hole isn't a singularity, but rather an extremely dense, degenerate core made of quarks or strings that prevents the full collapse to infinity, yet still also prevents the escape of photons outside the event horizon. And if such a degenerate state exists, does it end all discussion on wormholes and portals to other dimensions via black holes? I've seen endless models of black holes pinching off baby universes. I don't know if I believe in these theories (although I have no reason not to), but it seems to me that these models could not exist if a black hole doesn't end in a singularity.