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Theory of non-Gaussianity in warm inflation

Lookup NU author(s): Professor Ian MossORCiD

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Abstract

The theory and methodology is developed to compute the bispectrum in warm inflation, leading to results for the non-linearity parameter and the shape of the bispectrum. Particular attention is paid to the study of the bispectrum in the regime of weak dissipation and how stochastic fluctuations affect the bispectrum. It is shown that, in contrast to the strong dissipative regime, the amplitude of non-Gaussianity is strongly dependent on the parameters governing the microscopic physics in the intermediate and weak dissipation warm inflation regimes. The most important results concern the shape of the bispectrum, which has two different, but distinct, forms in the weak and strong dissipative regimes.

Publication metadata

Author(s): Bastero-Gil M, Berera A, Moss IG, Ramos RO

Publication type: Article

Publication status: Published

Journal: Journal of Cosmology and Astroparticle Physics

Year: 2014

Volume: 2014

Issue: 12

Online publication date: 04/12/2014

Acceptance date: 28/10/2014

Date deposited: 19/01/2016

ISSN (electronic): 1475-7516

Publisher: IOP Publishing Ltd

URL: http://dx.doi.org/10.1088/1475-7516/2014/12/008

DOI: 10.1088/1475-7516/2014/12/008

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