I just came across this article about "torsion" (vector? part of relativity equations?) inside a black hole
https://www.insidescience.org/content/every-black-hole-contains-new-universe/566 and how it might relate to our universe from another. I wonder what the mass of the black hole would need to reach for this effect to happen? Or would it happen inside any size black hole, and therefore our known universe would have other universes within each black hole and the mass of the black hole is maintained? This is back from 2010, but I must have missed this way of stating it. I do remember something about a physicist saying black holes could lead to another universe due to particle quantum spin. Maybe this is the same guy
https://en.wikipedia.org/wiki/Nikodem_Pop%C5%82awski .
Is this theory is still holding up? Dark matter and energy may be related to anti-matter? That would be interesting if WIMPs are related to this. Looks like another part of physics that I will never be able to calculate for myself, and hope for professors to explain to me in layman's terms. This would be a fun issue to bring up on Baron's Astronomy show on KZSB! Maybe Youtube has the answer...