Non-Gaussianity from false vacuum inflation: Old curvaton scenario.
Yi Wang Chunshan Lin Jinn-Ouk Gong
posted in Astrophysics on Tuesday, December 15th, 2009
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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