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Thread: Big Bang / Black Hole

  1. #1 Big Bang / Black Hole 
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    Before the Big Bang, all the matter and energy in the universe was concentrated in one point, was that point a Black Hole that could have unraveled? Or did physics not "work" back then?
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  2. #2  
    Junior Member PM_ME_URANUS's Avatar
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    That's a way to think about it
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  3. #3  
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    Quote Originally Posted by ThirdReaction View Post
    Before the Big Bang, all the matter and energy in the universe was concentrated in one point, was that point a Black Hole that could have unraveled? Or did physics not "work" back then?
    That's a great question. One that's always puzzled me but never got around to asking or seeking the answer too or forget the answer if I did get it so I'm not sure what the answer is. Back then all of the energy was compressed into a small volume. Perhaps since the total energy of the universe was zero it couldn't be a black hole.

    See Zero-energy universe - Wikipedia, the free encyclopedia

    Gravitational energy can't be counted on as part of the stress-energy-momentum (SEM) tensor. I'll look into this more with some experts on the subject that I know.
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  4. #4  
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    Since the entire universe was in a single point probably the size of a singularity would it still have been a flat universe? It was all concentrated in that point so would curvature be extreme in that sense or not exist as space-time did not exist? Or did space-time exist prior? Which would have allowed a flat universe? If I understand that article correctly, I may not be so please excuse my ignorance.
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  5. #5  
    Administrator Markus Hanke's Avatar
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    Not wanting to speculate on what gave rise to the BB, I would just like to remark that the BB singularity is a purely classical result based on the extrapolation of a classical theory ( General Relativity ). In reality though the early evolution of the universe was very far from being a classical process, so I would regard the notion of a "BB singularity" was more than just a grain of salt.

    As for the comparison between black holes and the BB, while there are some conceptual similarities, the actual geometry of these two regions of space-time is vastly different, so I don't think they can be compared in any meaningful way. The evaporation of a Vaidya-Bonnet black hole ( the type most suitable for this scenario ) just isn't the same as metric expansion of a small region, so these are physically distinct events.
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  6. #6  
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    In reply to ThirdReaction, re: your #1 post.

    Your "open-ended" question answers itself. Obviously, there were no "rules" until "BB" decided to expand...actually.
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  7. #7  
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    perhaps there wasn't a big bang - maybe the CMB is a natural background temperature of space.
    if you'd like to see how Monty Python might explain this, visit a show video I posted at
    Monty Python and the CMB Argument - YouTube
    Last edited by KJW; 09-12-2014 at 12:52 PM. Reason: Adjusted Link URL
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