this post was submitted on 13 Aug 2023
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Cover author: Michał Kałużny http://astrofotografia.pl/
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I'm also no authority, but I strongly disagree that "it follows" that the stuff must be coming out.
We know that stuff enters black holes, and we know that they gain mass when it does. We think they shrink in mass over extreme periods of time, but other than that, I'm fairly sure we've never seen a black hole lose mass.
So if the mass comes out in a white hole, why does the black hole retain its mass?
I haven't read the book but I can't imagine he says, without strongly stating that it's very speculative, that such a thing could happen.
@exscape
@readbeanicecream
By definition, a manifold has a place where things go in, and other things come out. So yes, it does in fact logically follow. If its a manifold, then it logically follows that what goes in comes out.
You're saying we know a bunch of stuff I'm not certain we know.
My understanding is that by definition, the singularity has infinite mass and infinite gravity, so there is no way it can gain mass; because infinity + 1 = infinity. It's the very nature of infinities. You can have a number of infinities, but manipulating them arithmetically always yields infinity. 2 x infinity = infinity. 3 / infinity = infinity.
Like zero, it is more identity than number. 0 = nothing, infinity = everything.
So if you hope to have me follow your narrative, you're going to address this assertion concerning increasing the mass of black holes first.
Almost nobody actually believes the singularity is real, it's just what the math tells us -- it's where the math of GR breaks down, and a better theory of gravity would be needed to resolve it.
I've never heard a black hole described as a manifold, but then again I'm not sure exactly what a manifold is.
@exscape
@readbeanicecream
Also Idk what you are talking about nobody believing there's an actual singularity; I don't know what else you think is happening, or of what use the mathematics might be if it doesn't approach some degree of accuracy as concerns the physical character of the phenomena
Here's some reading about black holes singularities and whether they're real or not:
https://www.pbs.org/wgbh/nova/article/are-singularities-real/
https://en.wikipedia.org/wiki/Gravitational_singularity#Interpretation
We know that GR predicts some things extremely well, and QM some things extremely well, but they fundamentally disagree. Both CANNOT be entirely correct, and black holes is the most notable case where one or both break down. (See the "black hole information paradox".)