Non-Gaussianity from Axion-Gauge Fields Interactions during Inflation
Cosmology and Nongalactic Astrophysics
2018-11-28 v2 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
We study the scalar-tensor-tensor non-Gaussian signal in an inflationary model comprising also an axion coupled with SU(2) gauge fields. In this set-up, metric fluctuations are sourced by the gauge fields already at the linear level providing an enhanced chiral gravitational waves spectrum. The same mechanism is at work in generating an amplitude for the three-point function that is parametrically larger than in standard single-field inflation.
Cite
@article{arxiv.1806.05474,
title = {Non-Gaussianity from Axion-Gauge Fields Interactions during Inflation},
author = {Emanuela Dimastrogiovanni and Matteo Fasiello and Robert J. Hardwick and Hooshyar Assadullahi and Kazuya Koyama and David Wands},
journal= {arXiv preprint arXiv:1806.05474},
year = {2018}
}
Comments
References added. 19 pages, 5 figures