Non-Gaussianity from Preheating
Astrophysics
2007-05-23 v2 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
We consider a two-field model for inflation where the second order metric perturbations can be amplified by a parametric resonance during preheating. We demonstrate that there can arise a considerable enhancement of non-Gaussianity sourced by the local terms generated through the coupled perturbations. We argue that the non-Gaussianity parameter could be as large as f_{NL} ~ 50. Our results may provide a useful test of preheating in future CMB experiments.
Cite
@article{arxiv.astro-ph/0411394,
title = {Non-Gaussianity from Preheating},
author = {Kari Enqvist and Asko Jokinen and Anupam Mazumdar and Tuomas Multamaki and Antti Vaihkonen},
journal= {arXiv preprint arXiv:astro-ph/0411394},
year = {2007}
}
Comments
4 pages ReVTeX4, discussion and references added, conclusions unchanged