Newest theories have hypothesized a “vacuum energy” which sounds like what you might be talking about in part A: it acts sort of like the opposite of gravity, where the energy of a black hole would push matter away from it, at a certain point.
Part C seems to be coming up on black hole cosmology and unfortunately would be damn-near impossible to prove.
I'm not suggesting that the interior of a black hole is a universe, or that our universe is the interior of a black hole, rather I'm asking about the plausibility of a black hole, given sufficient growth by vacuum energy (if it even happens), could be the source of another "big bang" within the same constantly expanding fabric of spacetime and that any and all universes exist - causally disconnected - within said fabric?
In other words "singularity" -> produce a "big bang" -> black holes emerge -> black holes begin "charging/expanding/building mass/energy" via interior vacuum energy -> any of these black holes at their "peak" energy/mass state ala "singularity" -> produce a "big bang" -> repeat ad infinitum.
I don’t think so. With our current understanding of black holes, there seems to be no sort of peak energy one black hole can handle, they just keep growing depending on how much mass it can absorb.
Another thing is hawking radiation. As we understand it, black holes do decay, just very slowly. Because it’s theorized that supermassive black holes will completely decay in a relatively similar amount of time as a smaller black hole, you can hypothesize that the more mass leads to more hawking radiation EDIT: checked and the smaller a black hole, the quicker it does decay.
Does our understanding of Hawking radiation bake in the possibility of a singularity-free black hole (subject to interior vacuum energy) or the assumption there is a singularity (no interior vacuum energy)?
Does an expanding event horizon contradict the idea of a singularity? ie how does a point of infinite density permit a variable horizon if new mass doesn’t alter the density?
A singularity is quite literally the name of the impossible: it’s the point within a black hole that quantum physics breaks down. So you’re correct in that event horizons contradict them. EVERYTHING contradicts them, yet there they are.
And so yes, when Hawking was theorizing black hole decay, he was specifically trying to figure out what a singularity was. He collaborated on different theories just trying to understand singularities, whether black holes had them or not, and how they might be formed. They basically confirmed that, “yep, some spooky shit happens in there we don’t have the tools to understand yet.”
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Toebean_Farmer t1_ja8hfmy wrote
Newest theories have hypothesized a “vacuum energy” which sounds like what you might be talking about in part A: it acts sort of like the opposite of gravity, where the energy of a black hole would push matter away from it, at a certain point.
Part C seems to be coming up on black hole cosmology and unfortunately would be damn-near impossible to prove.