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Note on the production of scale-invariant entropy perturbation in the Ekpyrotic universe

Li, M.

Physics letters B. VOL 724; NUMBER 4-5, ; 2013, 192-197 -- Elsevier Science B.V., Amsterdam. Part 4-5; (pages 192-197) -- 2013

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  • Title:
    Note on the production of scale-invariant entropy perturbation in the Ekpyrotic universe
  • Author: Li, M.
  • Found In: Physics letters B. VOL 724; NUMBER 4-5, ; 2013, 192-197
  • Journal Title: Physics letters B.
  • Subjects: Physics; LCC: QC1; Dewey: 530
  • Publication Details: Elsevier Science B.V., Amsterdam.
  • Language: English
  • Abstract: In the standard entropic mechanism adopted in the simple Ekpyrotic models to generate the nearly scale-invariant and Gaussian primordial perturbation, the entropy direction is tachyonically unstable. In this Letter, we consider the stable production of the scale-invariant entropy perturbation in the Ekpyrotic universe via non-minimal couplings. In this model the non-minimally coupled massless scalar field serves as a spectator and is stabilized by the introduced non-minimal couplings. It always corresponds to the entropy field during the contraction and with appropriate couplings can obtain a scale-invariant spectrum. This scenario requires additional mechanisms such as curvaton or modulated preheating to convert the entropy perturbation to the curvature perturbation after the bounce.
  • Identifier: Journal ISSN: 0370-2693
  • Publication Date: 2013
  • Physical Description: Electronic
  • Shelfmark(s): 6478.762000
  • UIN: ETOCRN335708281

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