Non-Gaussianity from Axion-Gauge Fields Interactions during Inflation

Autor:	Dimastrogiovanni, Emanuela, Fasiello, Matteo, Hardwick, Robert J., Assadullahi, Hooshyar, Koyama, Kazuya, Wands, David
Rok vydání:	2018
Předmět:	Astrophysics - Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory
Druh dokumentu:	Working Paper
DOI:	10.1088/1475-7516/2018/11/029
Popis:	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. Comment: References added. 19 pages, 5 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1806.05474 Zobrazit plný text záznamu View this record from Arxiv