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Squeezed primordial bispectrum from general vacuum state

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.

preprint2013arXivOpen access
Jinn-Ouk GongMisao Sasaki
astro-ph.COhep-phgr-qchep-th
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Jinn-Ouk GongMisao Sasaki

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