Primordial Non-Gaussianity in Multi-Scalar Inflation

2007/11/19 by Shuichiro Yokoyama, Yokoyama, Shuichiro, Teruaki Suyama +3 · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics (astro-ph) #Cosmology and Gravitation Theories #FOS: Physical sciences #Geophysics and Gravity Measurements #Solar and Space Plasma Dynamics

paper · pdf · doi:10.48550/arxiv.0711.2920

openalex publication_date 2007/11/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

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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