Non-Gaussianity from false vacuum inflation: Old curvaton scenario

Abstract

We calculate the three-point correlation function of the comoving curvature perturbation generated during an inflationary epoch driven by false vacuum energy. We get a novel false vacuum shape bispectrum, which peaks in the equilateral limit. Using this result, we propose a scenario which we call "old curvaton". The shape of the resulting bispectrum lies between the local and the false vacuum shapes. In addition we have a large running of the spectral index.

13 pages, 3 figures; v2 with minor revison; v3 final version to appear on JCAP

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• Large Nonlocal Non-Gaussianity from a Curvaton Brane
• Numerical study of inflationary preheating with arbitrary power-law potential and a realization of curvaton mechanism
• Quadra-Spectrum and Quint-Spectrum from Inflation and Curvaton Models
• On primordial trispectrum from exchanging scalar modes in general multiple field inflationary models
• Revised $f_{\mathrm{NL}}$ parameter in Curvaton Scenario