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Density fluctuations from warm inflation

Lookup NU author(s): Dr Chris Graham, Professor Ian MossORCiD

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Abstract

Thermal fluctuations provide the main source of large scale density perturbations in warm inflationary models of the early universe. For the first time, general results are obtained for the power spectrum in the case when the friction coefficient in the inflaton equation of motion depends on temperature. A large increase in the amplitude of perturbations occurs when the friction coefficient increases with temperature. This has to be taken into account when constructing models of warm inflation. New results are also given for the thermal fluctuations in the weak regime of warm inflation when the friction coefficient is relatively small.

Publication metadata

Author(s): Graham C, Moss IG

Publication type: Article

Publication status: Published

Journal: Journal of Cosmology and Astroparticle Physics

Year: 2009

Issue: 7

Pages: 013

ISSN (print): 1475-7516

ISSN (electronic):

Publisher: Institute of Physics Publishing Ltd.

URL: http://dx.doi.org/10.1088/1475-7516/2009/07/013

DOI: 10.1088/1475-7516/2009/07/013

Notes: Article no. 013

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