Primordial Non-Gaussianity in Multi-Scalar Inflation

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

2007-11-19

arxiv.org/abs/0711.2920v2

Phys.Rev.D77:083511,2008

Astronomy and Astrophysics

Astrophysics

11 pages, 6 figures, replaced with the version published in Physical Review D

Scientific paper

10.1103/PhysRevD.77.083511

We give a concise formula for the non-Gaussianity of the primordial curvature perturbation generated on super-horizon scales in multi-scalar inflation model without assuming slow-roll conditions. This is an extension of our previous work. Using this formula, we study the generation of non-Gaussianity for the double inflation models in which the slow-roll conditions are temporarily violated after horizon exit, and we show that the non-linear parameter $f_{NL}$ for such models is suppressed by the slow-roll parameters evaluated at the time of horizon exit.

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