Primordial Non-Gaussianity in Multi-Scalar Slow-Roll Inflation

Details Primordial Non-Gaussianity in Multi-Scalar Slow-Roll Inflation Primordial Non-Gaussianity in Multi-Scalar Slow-Roll Inflation

2007-05-22

arxiv.org/abs/0705.3178v1

JCAP 0707:013,2007

Astronomy and Astrophysics

Astrophysics

8 pages

Scientific paper

10.1088/1475-7516/2007/07/013

We analyze the non-Gaussianity for primordial curvature perturbations generated in multi-scalar slow-roll inflation model including the model with non-separable potential by making use of $\delta N$ formalism. Many authors have investigated the possibility of large non-Gaussianity for the models with separable potential, and they have found that the non-linear parameter, $f_{NL}$, is suppressed by the slow-roll parameters. We show that for the non-separable models $f_{NL}$ is given by the product of a factor which is suppressed by the slow-roll parameters and a possible enhancement factor which is given by exponentials of quantities of O(1).

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