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Research suggests Big Bang may have taken place inside a black hole
601–610 of 647 posts
Re: Research suggests Big Bang may have taken place inside a black hole
#602as we approach the potential singularity, the size of the universe changes as a (hyperbolic) function of cosmic time
Glad to hear that. I'm looking forward to any theories how to convert time to space (and back) ..with orthogonal universes/singularities ?
Re: Research suggests Big Bang may have taken place inside a black hole
#603Earlier quoted context omitted.
>in a higher-dimensional parent universe That's incorrect: The parent universe is not higher-dimensional, it's the same good old 3+1 as our universe. What they propose is: Let's take our good old GR, and start with a (large, dilute) compactly supported spherically collapsing collapsing cloud of matter. During that, you get an event horizon; afterwards, this looks like a normal black hole outside, and you never see th…
> with the cosmological horizon somehow (?) corresponding to the BH horizon as viewed from the outside. That’s not mentioned in the summary. After inflation the event horizon would not exist.
I have not really looked at the summary, opted to go straight to the source.
This identification happens in equations 31-34 on page 7f subsection "Cosmic Acceleration" in https://arxiv.org/abs/2505.23877
The justification looks super sketchy and hand-wavy to me, though, which I summarized as "somehow (?)".
"After inflation the event horizon would not exist."
Apparent cosmological constant viewed from the bouncing inside induces a cosmological horizon, which they identify with the black hole horizon viewed from the outside. Super elegant idea, but I don't buy that this is supposed to be true.
Re: Research suggests Big Bang may have taken place inside a black hole
#604Earlier quoted context omitted.
>in a higher-dimensional parent universe That's incorrect: The parent universe is not higher-dimensional, it's the same good old 3+1 as our universe. What they propose is: Let's take our good old GR, and start with a (large, dilute) compactly supported spherically collapsing collapsing cloud of matter. During that, you get an event horizon; afterwards, this looks like a normal black hole outside, and you never see th…
Why does this black hole bounce whilst others from the limited info we possess appear to be stable regardless of lack of singularity
The bounce is invisible from the outside -- an event horizon means causal decoupling. From outside, the formation of the black hole looks like the good old "frozen star" picture.
There will never be observational evidence on what happens on the other side of any event horizon, you'd have to cross over to the other side to see it for yourself (but you won't be able to report back your findings). There's a fun greg egan short story about that ;)
Re: Research suggests Big Bang may have taken place inside a black hole
#605[dead]
Re: Research suggests Big Bang may have taken place inside a black hole
#606Earlier quoted context omitted.
Do you find the idea of an infinite regress -- "our universe is a child of another universe and that is a child of another universe and so forth" -- holds much explanatory power for you? To me it's prima facie a hollow explanation. I get that some models, like eternal inflation or certain cyclic cosmologies, entertain the idea of an infinite past or blur the standard arrow of time... but how does pushing the origin q…
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where is the "prediction and simplicity" part in this theory?
Re: Research suggests Big Bang may have taken place inside a black hole
#607Suggested hard sci-fi light reading: "Cosm" by Gregory Benford, 1999. A universe the size of a bowling ball created in a laboratory. The scientist responsible for it, keeping it safe and on the run from gvt spooks. They want to protect it for as long as it lasts, and since its time is as relative as its size, they won't have long to wait.
Added. Opinions: A) I love all the scifi book recommendations that cone up on HN B) i wish you’d all stop recommending great and amazing books. My queue is so backlogged and jammed I'm never going to catch up.
OK then, I'd be remiss if I didn't mention my own sci-fi book I put out there free forever to listen ( https://www.youtube.com/watch?v=mtxgpaXp9vA ) and free forever to read/download/listen ( https://archive.org/details/stargazer-steven-pitzl ) because I don't want to navigate the self-publishing world, just want some feedback before I die.
Only joking, I'm remiss anyways.
Re: Research suggests Big Bang may have taken place inside a black hole
#608Earlier quoted context omitted.
Why does this black hole bounce whilst others from the limited info we possess appear to be stable regardless of lack of singularity
The bounce is invisible from the outside -- an event horizon means causal decoupling. From outside, the formation of the black hole looks like the good old "frozen star" picture. There will never be observational evidence on what happens on the other side of any event horizon, you'd have to cross over to the other side to see it for yourself (but you won't be able to report back your findings). There's a fun greg ega…
What's the story?
Re: Research suggests Big Bang may have taken place inside a black hole
#609Earlier quoted context omitted.
I don't see how this is. It seems eminently reasonable that observation can simply be performed by sub-omnipotent beings.
Life is one omnipotent being. It's just ego, thoughts and social identity that creates the illusion of multiple beings. But ego and names are made up. Separation just thoughts. The more life believes in thoughts it becomes divided. But the waves and ocean are one.
To quote the philosopher Hank Hill, "Yeah, yeah, I know, everything is one way, then it's the opposite."
Re: Research suggests Big Bang may have taken place inside a black hole
#610> The Big Bang is often described as the explosive birth of the universe – a singular moment when space, time and matter sprang into existence. It is indeed "often described" in the media as such. However, that is _not_ the currently accepted theory. "What if there were no space and time before the Big Bang" is just Stephen Hawking's pet theory.
Might as well believe in God if you’re going to believe in spontaneous accidental creation…
To me, calling the unknown "God" is imposing a term loaded with human preconception and biases in exactly the place you don't want those things.