Enhancement of Non-Gaussianity after Inflation

Details Enhancement of Non-Gaussianity after Inflation Enhancement of Non-Gaussianity after Inflation

2003-08-06

arxiv.org/abs/astro-ph/0308088v4

JHEP 0404:006,2004

Astronomy and Astrophysics

Astrophysics

12 pages, LaTeX file. Revised to match the final version accepted for publication on JHEP

Scientific paper

10.1088/1126-6708/2004/04/006

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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