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Big bang versus black hole

  1. Feb 8, 2013 #1
    In this FAQ at the Baez website, the big bang singularity is contrasted with a black and white hole as a possible beginning of our universe.

    Is the Big Bang a black hole?
    http://math.ucr.edu/home/baez/physics/Relativity/BlackHoles/universe.html

    [I'm not interested in answering the title question,which is NO, but rather exploring the differences.]

    A few major differences are outlined:


    So, the first sentence appears to be a major distinction between a BB and a BH. ok.

    Three questions:

    what about the temperature difference between the two....less than 3 degrees K for many black holes and 1028 degrees K for the big bang....Does this manifest in the differences or is temperature relatively unimportant?

    Also, Is SPACE hardly curved at the big bang, just time, while for a black hole both space and time are severely curved?? If so, does the extreme curvature of time relate to the temperature difference? to the initial expansion/repulsion?

    Do we have any quantum insights yet that support, contradict or offer other insights?

    edit: from another thread, I saved this partial insight:

    Pervect: "Because the stress-energy tensor for expanding matter is different from the stress-energy tensor of non-expanding matter, you can have compact, dense, expanding objects that are not black holes." ok.
     
  2. jcsd
  3. Feb 8, 2013 #2
    I posted this elsewhere:
    Sounds interesting, but I do not have any of those predictions.

    http://www.knowledgerush.com/kr/encyclopedia/Spacetime/

    I checked Lee Smolin's THREE ROADS TO QUANTUM GRAVITY [year 2000] and he discusses LQG
    in terms of evolving [Penrose] spin networks in some detail, and has done research himself, but says nothing about the geometry relative to BH and BB...
     
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