Large Nongaussianity from Nonlocal Inflation
High Energy Physics - Theory
2009-11-13 v2 Astrophysics
High Energy Physics - Phenomenology
Abstract
We study the possibility of obtaining large nongaussian signatures in the Cosmic Microwave Background in a general class of single-field nonlocal hill-top inflation models. We estimate the nonlinearity parameter f_{NL} which characterizes nongaussianity in such models and show that large nongaussianity is possible. For the recently proposed p-adic inflation model we find that f_{NL} ~ 120 when the string coupling is order unity. We show that large nongaussianity is also possible in a toy model with an action similar to those which arise in string field theory.
Keywords
Cite
@article{arxiv.0704.3426,
title = {Large Nongaussianity from Nonlocal Inflation},
author = {N. Barnaby and J. M. Cline},
journal= {arXiv preprint arXiv:0704.3426},
year = {2009}
}