Every black hole has a singularity. But the singularity is covered by a thing called 'Event horizon'or ' Schwarzchild Radius'. Our universe is originated from a naked singularity. By naked singularity, I mean that the singularity wasn't covered by the event horizon. Is it possible that a black hole has a universe in itself?
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Note that the the Big Bang wasn't a naked singularity. It was a past incomplete spacelike singularity. A naked singularity is timelike. – John Rennie Sep 07 '20 at 04:29
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I, and I’m sure many many others, have thought about this ever since knowing about black holes.
Both in popular media and in more scientific articles, there’s plenty of viewpoints/interpretations along these lines
https://www.insidescience.org/news/every-black-hole-contains-new-universe
https://iopscience.iop.org/article/10.3847/0004-637X/832/2/96
Personally, I think if black holes can somehow be married with the ideas of quantum gravity/information one day, then recursive black holes (since the ‘universes’ inside them might also contain them) might prove to be impossible and that would somewhat contradict the recursive universe theories.
I also dread the day someone had to define exactly what a universe “U” would mean, from a definition point of view..
buddhabrot
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