Scalar perturbation spectra from warm inflation

Lisa M H Hall, Ian G. Moss, Arjun Berera

Research output: Contribution to journalArticlepeer-review


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 inflaton field and thermal radiation using a combination of thermal field theory and thermodynamics. The perturbation equations include the effects of a damping coefficient F 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.

Original languageEnglish
Article number083525
JournalPhysical Review D, Particles and fields
Issue number8
Publication statusPublished - 2004

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