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Effects of gravitational Chern-Simons during Axion-SU(2) inflation

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Published 11 June 2020 • © 2020 The Author(s)
, , Citation Leila Mirzagholi et al JCAP06(2020)024 DOI 10.1088/1475-7516/2020/06/024

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1 Max Planck Institute for Astrophysics, Karl-Schwarzschild-Str.1, 85741 Garching, Germany

2 Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), UTIAS, The University of Tokyo, Chiba 277-8583, Japan

3 Department of Physics, National Institute of Technology, Gunma College, Gunma 371-8530, Japan

Dates

  1. Received 31 March 2020
  2. Accepted 30 April 2020
  3. Published

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1475-7516/2020/06/024

Abstract

In this paper we examine the viability of inflation models with a spectator axion field coupled to both gravitational and SU(2) gauge fields via Chern-Simons couplings. Requiring phenomenological success of the axion-SU(2) sector constrains the coupling strength of the gravitational Chern-Simons term. We find that the impact of this term on the production and propagation of gravitational waves can be as large as fifty percent enhancement for the helicity that is not sourced by the gauge field, if the cut-off scale is as low as Λ = 20H. The effect becomes smaller for a larger value of Λ, while the impact on the helicity sourced by the gauge field is negligible regardless of Λ.

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© 2020 CERN. Published by IOP Publishing Ltd on behalf of Sissa Medialab. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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10.1088/1475-7516/2020/06/024