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Goodbye Big Bang, hello black hole?

  1. Sep 8, 2013 #1


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    Holographic BB out of prior BH (stringy version of BH bounce)

    Out of the White Hole: A Holographic Origin for the Big Bang
    Razieh Pourhasan, Niayesh Afshordi, Robert B. Mann
    (Submitted on 5 Sep 2013)
    While most of the singularities of General Relativity are expected to be safely hidden behind event horizons by the cosmic censorship conjecture, we happen to live in the causal future of the classical big bang singularity, whose resolution constitutes the active field of early universe cosmology. Could the big bang be also hidden behind a causal horizon, making us immune to the decadent impacts of a naked singularity? We describe a braneworld description of cosmology with both 4d induced and 5d bulk gravity (otherwise known as Dvali-Gabadadze-Porati, or DGP model), which exhibits this feature: The universe emerges as a spherical 3-brane out of the formation of a 5d Schwarzschild black hole. In particular, we show that a pressure singularity of the holographic fluid, discovered earlier, happens inside the white hole horizon, and thus need not be real or imply any pathology. Furthermore, we outline a novel mechanism through which any thermal atmosphere for the brane, with comoving temperature of 20% of the 5D Planck mass can induce scale-invariant primordial curvature perturbations on the brane, circumventing the need for a separate process (such as cosmic inflation) to explain current cosmological observations. Finally, we note that 5D space-time is asymptotically flat, and thus potentially allows an S-matrix or (after minor modifications) AdS/CFT description of the cosmological big bang.
    16 pages, 3 figures
  2. jcsd
  3. Sep 19, 2013 #2

    Out of the White Hole: A Holographic Origin for the Big Bang

    Is anything blatantly wrong with this concept?

    "For all physicists know, dragons could have come flying out of the singularity," stated Niayesh Afshordi

    Last edited by a moderator: Sep 19, 2013
  4. Sep 19, 2013 #3


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    To quote the article:

    I'd remain skeptical.
  5. Sep 19, 2013 #4
    oh come on, the PF is a peer review of and of in its self, right? lets embrace it, no?
  6. Sep 19, 2013 #5


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    Not at all!
    PF is a forum, not a science journal.
  7. Sep 19, 2013 #6


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    This is rather ... speculative, to put it mildly. I never heard of these guys.
  8. Sep 20, 2013 #7
    Niayesh Afshordi, is a scientist with a very descent background certainly to be taken seriously!

    Take a look at the Arxiv database for further papers

    Also Marcus started a threat over at "Beyond the standard model" handling this paper.
    Last edited: Sep 20, 2013
  9. Sep 20, 2013 #8


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    No, we're not. We stick to stuff that has already been professionally peer-reviewed (i.e. published in a mainstream journal) or is at least demonstrably taken seriously in professional circles. Arxiv.org is not formally peer-reviewed. Highly speculative stuff does show up there, that never gets off the ground with other people besides the author. Therefore we usually avoid stuff that appears only on arxiv.org.

    You can review our rules by clicking "Site Info" at the top of the page and choosing "Rules & Guidelines."
  10. Sep 20, 2013 #9


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    I glanced at this a bit ago. Doesn't seem completely crazy. But it's one of a great many of extremely speculative ideas, and I don't think it's any more likely to be correct than the others.
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