Non-Gaussianity from axion-gauge fields interactions during inflation

Emanuela Dimastrogiovanni; Matteo Fasiello; Robert J. Hardwick; Hooshyar Assadullahi; Kazuya Koyama; David Wands

doi:10.1088/1475-7516/2018/11/029

Non-Gaussianity from axion-gauge fields interactions during inflation

Emanuela Dimastrogiovanni
, Matteo Fasiello
, Robert J. Hardwick
, Hooshyar Assadullahi
, Kazuya Koyama
, David Wands

Institute of Cosmology & Gravitation

Research output: Contribution to journal › Article › peer-review

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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.

Original language	English
Article number	029
Journal	Journal of Cosmology and Astroparticle Physics
Volume	2018
Issue number	11
DOIs	https://doi.org/10.1088/1475-7516/2018/11/029
Publication status	Published - 19 Nov 2018

Keywords

RCUK
STFC
ST/N000668/1
ST/N5044245

Access to Document

10.1088/1475-7516/2018/11/029Licence: Unspecified

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Data availability statement for 'Non-Gaussianity from axion-gauge fields interactions during inflation'.
Dimastrogiovanni, E. (Creator), Fasiello, M. R. (Creator), Hardwick, R. (Creator), Assadullahi, H. (Creator), Koyama, K. (Creator) & Wands, D. (Creator), IOP Publishing, 19 Nov 2018
Dataset

Cosmological Tests of Gravity
Koyama, K. (PI)
European Research Council
1/09/15 → 31/08/20
Project: Research

Cite this

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AU - Dimastrogiovanni, Emanuela

AU - Fasiello, Matteo

AU - Hardwick, Robert J.

AU - Assadullahi, Hooshyar

AU - Koyama, Kazuya

AU - Wands, David

N1 - v2 References added. 19 pages, 5 figures

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AB - 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.

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KW - ST/N5044245

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DO - 10.1088/1475-7516/2018/11/029

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VL - 2018

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

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M1 - 029

ER -

Non-Gaussianity from axion-gauge fields interactions during inflation

Abstract

Keywords

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Datasets

Data availability statement for 'Non-Gaussianity from axion-gauge fields interactions during inflation'.

Projects

Cosmological Tests of Gravity

Cite this