6
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Quantum bounce and cosmic recall

      Preprint
      ,

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Loop quantum cosmology predicts that, in simple models, the big bang singularity of classical general relativity is replaced by a quantum bounce. Because of the extreme physical conditions near the bounce, a natural question is whether the universe can retain, after the bounce, its memory about the previous epoch. More precisely, does the universe retain various properties of the state after evolving unitarily through the bounce or does it suffer from some cosmic amnesia as has been recently suggested? Here we show that this issue can be answered unambiguously at least within an exactly solvable model, derived from a small simplification of loop quantum cosmology, for which there is full analytical control on the quantum theory. We show that if there exists a semiclassical state at late times on one side, peaked around a pair of canonically conjugate variables, then there are very strong bounds on the fluctuations on the other side of the bounce, implying semi-classicality. For such a model universe which grows to a size of 1 megaparsec, at late times, the change in relative fluctuations of the only non-trivial observable of the model across the bounce is less than \(10^{-56}\) (becoming smaller for universes which grow larger). The universe maintains (an almost) total recall.

          Related collections

          Author and article information

          Journal
          24 October 2007
          2008-03-27
          Article
          10.1103/PhysRevLett.100.161302
          0710.4543
          bcc35797-710e-4561-8cbb-a89d83bd96f2
          History
          Custom metadata
          IGC-07/10-02, PI-QG-66
          Phys.Rev.Lett.100:161302,2008
          Some clarifying remarks and references added. To appear in Physical Review Letters
          gr-qc hep-th

          Comments

          Comment on this article