Enhancement of Non-Gaussianity after Inflation
Astrophysics
2009-11-10 v4 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
High Energy Physics - Theory
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.
Keywords
Cite
@article{arxiv.astro-ph/0308088,
title = {Enhancement of Non-Gaussianity after Inflation},
author = {N. Bartolo and S. Matarrese and A. Riotto},
journal= {arXiv preprint arXiv:astro-ph/0308088},
year = {2009}
}
Comments
12 pages, LaTeX file. Revised to match the final version accepted for publication on JHEP