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Non-anthropic String Theory Landscape and Finite Universes

  1. May 28, 2014 #1
    What are you thoughts about Laura Mersini Haughton´s theory of the multiverse? She predicted a CMB cold spot, power suppression at low multipoles, preferred direction associated with the quadrupole octupole alignment, dark flow, and the deviation of the CMB amplitude. While dark flow remains controversial, the other predictions have been confirmed.
    (See
    http://arxiv.org/abs/0809.3623
    http://arxiv.org/pdf/0810.5388.pdf
    http://arxiv.org/pdf/hep-th/0611223v1.pdf
    http://arxiv.org/pdf/hep-th/0612142v1.pdf
    for more information)


    On the other hand, there are other interesting theories of finite universes. The my favourites are http://arxiv.org/pdf/astro-ph/9901364.pdf
    http://arxiv.org/pdf/astro-ph/0310253v1.pdf
    http://arxiv.org/pdf/1310.1245.pdf
    by Luminet and
    http://arxiv.org/pdf/gr-qc/0108043.pdf
    http://arxiv.org/pdf/astro-ph/9807206.pdf
    http://arxiv.org/pdf/astro-ph/9802021.pdf
    by Levin

    What are your comments on this?
     
  2. jcsd
  3. May 31, 2014 #2
    There's also work by kashlinsky out there on dark flow. Is it valid?
     
  4. May 31, 2014 #3

    bapowell

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    Were these predictions or post-dictions?
     
  5. Jun 1, 2014 #4

    Chronos

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    This is a good example of why we should be cautious when a conjecture yields a prediction that has observational support. It deserves further consideration, but, little more.
     
  6. Jun 1, 2014 #5
    The amazing thing is that they all were PREdictions!!!!
     
  7. Jun 2, 2014 #6

    bapowell

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    Can you provide references where she predicts these effects?
     
  8. Jun 2, 2014 #7
    Last edited by a moderator: Sep 25, 2014
  9. Jun 2, 2014 #8

    bapowell

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    But these are all dated after the discovery of the effects. I would consider these post-dictions then.
     
  10. Jun 3, 2014 #9
    http://arxiv.org/pdf/hep-ph/0405218.pdf
    and
    http://arxiv.org/pdf/hep-th/0410213.pdf
    are a bit older, I think.

    As far as I know, dark flow was discovered on october 2008. http://www.nasa.gov/centers/goddard/pdf/276176main_ApJLetters_20Oct2008.pdf
    and the papers of Houghton I'm citing above were writen on 2004 and February 2008, that is, BEFORE (there you have at least one PREdiction).
    Regarding the spot and the octupoles, I think you're right there.

    Anyway, post-dictions, in this case, aren't a reason for paying less attention to the theory. I think this theory deserved much more attention than what it received.

    And.....

    What are your thoughts on Luminet's and Levin's works on closed/finite universes?
     
  11. Jun 3, 2014 #10

    bapowell

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    True, but the theories then are less compelling.

    I don't have any yet...I will have a look at the references. Thanks!
     
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