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Evolution of large scale curvature fluctuations during the perturbative decay of the inflaton

Fabrizio Di Marco*

Fabio Finelli†

Alessandro Gruppuso‡

  • Dipartimento di Fisica, Università degli Studi di Bologna and INFN, Via Irnerio 46, I-40126 Bologna, Italy

  • INAF/IASF-BO, Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna, Via Gobetti 101, I-40129 Bologna, Italy, INAF/OAB, Osservatorio Astronomico di Bologna, Via Ranzani 1, I-40127 Bologna, Italy, and INFN, Sezione di Bologna, Via Irnerio 46, I-40126 Bologna, Italy

  • INAF/IASF-BO, Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna, Via Gobetti 101, I-40129 Bologna, Italy and INFN, Sezione di Bologna, Via Irnerio 46, I-40126 Bologna, Italy

  • *dimarco@bo.infn.it
  • †finelli@iasfbo.inaf.it
  • ‡gruppuso@iasfbo.inaf.it
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Phys. Rev. D 76, 043530 – Published 31 August, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.043530

Abstract

We study the evolution of cosmological fluctuations during and after inflation driven by a scalar field coupled to a perfect fluid through a friction term. During the slow-roll regime for the scalar field, the perfect fluid is also frozen and isocurvature perturbations are generated. After the end of inflation, during the decay of the inflaton, we find that a change in the observationally relevant large scale curvature fluctuations is possible.

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Phys. Rev. D 76, 043530– Published 31 August, 2007
  • Received 17 May 2007

© 2007 American Physical Society

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