Folded Resonant Non-Gaussianity in General Single Field Inflation

Abstract

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.

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

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Cited by in corpus (7)

• A Note on Calm Excited States of Inflation
• A note on the role of the boundary terms for the non-Gaussianity in general k-inflation
• Resonant Trispectrum and a Dozen More Primordial N-point functions
• Non-Gaussianity in single field models without slow-roll
• Non-Gaussianities of Single Field Inflation with Non-minimal Coupling
• Minimal cut-off vacuum state constraints from CMB bispectrum statistics
• Primordial Features as Evidence for Inflation