Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inflationary NonGaussianity from Thermal Fluctuations   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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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: math
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas