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Scalar perturbation spectra from warm inflation

Lookup NU author(s): Lisa Hall, Professor Ian MossORCiD

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Abstract

We present a numerical integration of the cosmological scalar perturbation equations in warm inflation. The initial conditions are provided by a discussion of the thermal fluctuations of an inflation field and thermal radiation using a combination of thermal field theory and thermodynamics. The perturbation equations include the effects of a damping coefficient Γ and a thermodynamic potential V. We give an analytic expression for the spectral index of scalar fluctuations in terms of a new slow-roll parameter constructed from Γ. A series of toy models, inspired by spontaneous symmetry breaking and a known form of the damping coefficient, lead to a spectrum with n s>1 on large scales and ns<1 on small scales.

Publication metadata

Author(s): Hall LMH, Moss IG, Berera A

Publication type: Article

Publication status: Published

Journal: Physical Review D

Year: 2004

Volume: 69

Issue: 8

ISSN (print): 0556-2821

ISSN (electronic): 1089-4918

Publisher: American Physical Society

URL: http://dx.doi.org/10.1103/PhysRevD.69.083525

DOI: 10.1103/PhysRevD.69.083525

Notes: Article no. 083525 11 pages

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