Theory of non-Gaussianity in warm inflation

Mar Bastero-Gil*, Arjun Berera, Ian G. Moss, Rudnei O. Ramos

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number008
JournalJournal of Cosmology and Astroparticle Physics (JCAP)
Volume2014
Issue number12
DOIs
Publication statusPublished - 1 Dec 2014

Keywords

  • Cosmological perturbation theory
  • Inflation
  • Non-gaussianity

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