Non-Gaussianity from false vacuum inflation: Old curvaton scenario

Details Non-Gaussianity from false vacuum inflation: Old curvaton scenario Non-Gaussianity from false vacuum inflation: Old curvaton scenario

2009-12-15

arxiv.org/abs/0912.2796v3

JCAP03(2010)004

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

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

Scientific paper

10.1088/1475-7516/2010/03/004

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.

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