Enhancement of Non-Gaussianity after Inflation

N. Bartolo; S. Matarrese; A. Riotto

doi:10.1088/1126-6708/2004/04/006

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Enhancement of Non-Gaussianity after Inflation

N. Bartolo·S. Matarrese·A. Riotto

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Abstract

We study the evolution of cosmological perturbations on large scales, up to second order, for a perfect fluid with generic equation of state. Taking advantage of super-horizon conservation laws, it is possible to follow the evolution of the non-Gaussianity of perturbations through the different stages after inflation. We find that a large non-linearity is generated by the gravitational dynamics from the original inflationary quantum fluctuations. This leads to a significant enhancement of the tiny intrinsic non-Gaussianity produced during inflation in single-field slow-roll models.

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N. Bartolo, S. Matarrese, A. Riotto. 2004-04-05. Enhancement of Non-Gaussianity after Inflation. https://doi.org/10.1088/1126-6708%2F2004%2F04%2F006

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