Imagine if it is true that the known universe is the center of a very large black hole. Which then suggests that even small black holes hold universes in their centers. I mean why not, right? Which begs the question that if we can create black holes in a lab, does that mean we were able to create (and destroy) universes too and just not know it?
The extent of my knowledge of astrophysics and relativity are around the size of the next comma in this sentence, but wouldn’t a great deal of time pass “inside” such a black hole such that a “universe” could rise and fall in what would seem to us as just a few microseconds due to relativistic effects?