I thought we'd have gravitational interferences from other universes if there were multiverses. I also subscribed to the idea that black holes are contact points with other universes. I don't have any math to back it up so it's just conjecture but hey, still pretty cool. I had another theory that there is radiation emitted from black holes that comes from other universes as a sort of feedback.
Might be complete nonsense.
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I thought the radiation would've just likely been the scrambled-up and corrupted matter they absorbed being fired back out? This of course could be utter nonsense if the stream of radiation maintains a fairly consistent concentration regardless of how much the black hole has or hasn't consumed.