Inflationary NonGaussianity from Thermal Fluctuations

Details Inflationary NonGaussianity from Thermal Fluctuations Inflationary NonGaussianity from Thermal Fluctuations

2007-12-14

arxiv.org/abs/0712.2345v3

JCAP 0805:014,2008

Physics

High Energy Physics

High Energy Physics - Theory

20 pages, 1 figure. v2, v3: references and acknowledgments updated

Scientific paper

10.1088/1475-7516/2008/05/014

We calculate the contribution of the fluctuations with the thermal origin to the inflationary nonGaussianity. We find that even a small component of radiation can lead to a large nonGaussianity. We show that this thermal nonGaussianity always has positive $f_{\rm NL}$. We illustrate our result in the chain inflation model and the very weakly dissipative warm inflation model. We show that $f_{NL}\sim {\cal O}(1)$ is general in such models. If we allow modified equation of state, or some decoupling effects, the large thermal nonGaussianity of order $f_{\rm NL}>5$ or even $f_{\rm NL}\sim 100$ can be produced. We also show that the power spectrum of chain inflation should have a thermal origin. In the Appendix A, we made a clarification on the different conventions used in the literature related to the calculation of $f_{\rm NL}$.

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