Squeezed primordial bispectrum from a general vacuum state

Jinn Ouk Gong, Misao Sasaki

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


We study the general relation between the power spectrum and the squeezed limit of the bispectrum of the comoving curvature perturbation produced during single-field slow-roll inflation when the initial state is a general vacuum. Assuming the scale invariance of the power spectrum, we derive a formula for the squeezed limit of the bispectrum, represented by the parameter fNL, which is not slow-roll suppressed and is found to contain a single free parameter for a given amplitude of the power spectrum. Then, we derive the conditions for achieving a scale-invariant fNL and discuss a few examples.

Original languageEnglish
Article number095005
JournalClassical and Quantum Gravity
Issue number9
StatePublished - 7 May 2013


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