WhoStalledMyCar OP t1_ja8ju98 wrote on February 27, 2023 at 5:18 PM

Reply to comment by Toebean_Farmer in Recently Correlated Black Hole Mass and Dark Energy Questions by WhoStalledMyCar

Yes to vacuum energy.

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.

Toebean_Farmer t1_ja8rq5u wrote on February 27, 2023 at 6:07 PM

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.

WhoStalledMyCar OP t1_ja8t9s8 wrote on February 27, 2023 at 6:17 PM

Hmmm, true.

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?

Toebean_Farmer t1_ja8wizu wrote on February 27, 2023 at 6:37 PM

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.”