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Past eternal universe in inflationary models

  1. Mar 23, 2010 #1
    Assuming inflation is true, we have this paper by Guth, Valenkin and Borde:
    http://cdsweb.cern.ch/record/521154
    which says that inflation cant be past eternal

    and then we have this paper saying it can be made past eternal:
    http://arxiv.org/abs/gr-qc/0301042

    Can anyone explain to me the discrepancy in layman terms?
     
  2. jcsd
  3. Mar 23, 2010 #2

    Chronos

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    Difference of opinon among respectable scientists. The eternal bounce scenario is not appealing because it inadequately explains how energy is recovered between cycles, imo.
     
  4. Mar 24, 2010 #3
    Thanks for that Chronos, can you describe in layman terms what are the different assumptions that lead them to the different conclusions? is there a consensus on this question amonst other comsologists?
     
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