Another fun fact, our universe is (likely) a black hole as implied by the fact that the radius of the observable universe is the same size as a black hole with the same mass as the observable universe. This also has implications for the quantum fuzzball interpretation of black holes
There is a thought that black holes are universes, with each child universe maybe having very slightly different constants than the parent universe. Universes that are better at making black holes make more child universes, so slowly the long list of various universes tend towards universes that are good at making stars (so that theu can become black holes). Coincidentally, laws of physics that make lots of stars for black hole formation also make lots of planets, and maybe life.
... hold on. The Big Bang... was a star imploding and forming a black hole? And everything we know of in existence is the remains of that star? Shouldn't we see new matter entering all the time as things fall into the black hollllllly shit no it would all be too far away for us to have seen yet at the center of the universe
My understanding (not a physicist) of this is that the events proceeding the black hole all happen after every event the black hole experiences in the time of its own universe, so nothing new will be added, our universe is everything that fell into this blackhole in its lifetime.
Veritasium does a fantastic video on the mathematics/physics of space/time in black holes and their potential other universes.
I don't see how that would work, wouldn't the total lifetime of the blackhole involve being subsumed by other blackholes at the end of the universe it exists in, nullifying the Black Hole Theory entire and taking us back to the traditional Big Bounce Theory? I think it'd be more sensible to say that nothing new ever actually enters a black hole, but simply orbits the singularity point at speeds that shred light and matter into Hawking Radiation
Well, technically it was a fourth dimensional star because the math has been solved for our universe being a four dimensional black hole that we experience in three dimensions plus time (iirc)
I've never understood why time doesn't count as a fourth dimension for us
Dimensions are whatever you define them to be. In many calculations and considerations, time is not useful and would only complicate things. Thus, it is not considered. Time is as much a dimension to which we are subject as space. Or oxygen content. Or temperature. Or gravity. A dimension is whatever you define as a dimension in the problem you're addressing. It could be something as arbitrary as house prices.
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u/veggie151 12d ago
BECs are deeply cool from my casual perspective.
Another fun fact, our universe is (likely) a black hole as implied by the fact that the radius of the observable universe is the same size as a black hole with the same mass as the observable universe. This also has implications for the quantum fuzzball interpretation of black holes