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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:
    which says that inflation cant be past eternal

    and then we have this paper saying it can be made past eternal:

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


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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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