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Evolution of nonlinear fluctuations in preheating after inflation

Yasusada Nambu and Yohei Araki

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We investigate the evolution of the nonlinear long wavelength fluctuations during preheating after inflation. By using the separate universe approach, the temporal evolution of the power spectrum of the scalar fields and the curvature variable is obtained numerically. We found that the amplitude of the large-scale fluctuations is suppressed after nonlinear evolution during preheating.


PACS

98.80.-k Cosmology

04.25.Nx Post-Newtonian approximation; perturbation theory; related approximations

MSC

83F05 Cosmology

Subjects

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 2 (21 January 2006)

Received 20 October 2005, in final form 25 November 2005

Published 28 December 2005



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