Folded Resonant Non-Gaussianity in General Single Field Inflation

Details Folded Resonant Non-Gaussianity in General Single Field Inflation Folded Resonant Non-Gaussianity in General Single Field Inflation

2010-08-15

arxiv.org/abs/1008.2485v3

JCAP 1012:003,2010

Physics

High Energy Physics

High Energy Physics - Theory

13 pages; v3, minor revision with clarification remarks, JCAP version

Scientific paper

10.1088/1475-7516/2010/12/003

We compute a novel type of large non-Gaussianity due to small periodic features in general single field inflationary models. We show that the non-Bunch-Davies vacuum component generated by features, although has a very small amplitude, can have significant impact on the non-Gaussianity. Three mechanisms are turned on simultaneously in such models, namely the resonant effect, non-Bunch-Davies vacuum and higher derivative kinetic terms, resulting in a bispectrum with distinctive shapes and running. The size can be equal to or larger than that previously found in each single mechanism. Our full results, including the resonant and folded resonant non-Gaussianities, give the leading order bispectra due to general periodic features in general single field inflation.

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