Cosmological perturbation with two scalar fields in reheating after inflation

1997/09/30 by A. Taruya, Y. Nambu · 5 citations
Engineering · Physics and Astronomy · #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Material Science and Thermodynamics #astro-ph #gr-qc

paper · pdf · doi:10.1016/s0370-2693(98)00378-5

published as Phys.Lett.B428:37-43,1998 · 13 pages, 2 Encapsulated Postscript figures, revtex, references are added and type miss is corrected

arxiv created 1998/02/19 · openalex publication_date 1998/05/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We investigate the cosmological perturbation of two-scalar field model during the reheating phase after inflation. Using the exact solution of the perturbation in long-wavelength limit, which is expressed in terms of the background quantities, we analyze the behavior of the metric perturbation. The oscillating inflaton field gives rise to the parametric resonance of the massless scalar field and this leads to the amplification of the iso-curvature mode of the metric perturbations.

Citations

• The Renormalization Group and Singular Perturbations: Multiple-Scales, Boundary Layers and Reductive Perturbation Theory

Cited by

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• Non-Gaussianity and cosmic uncertainty in curvaton-type models
• Parametric amplification of metric fluctuations during reheating in two field models
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