Primordial gravitational waves from axion-gauge fields dynamics

Emanuela Dimastrogiovanni, Matteo Fasiello, Tomohiro Fujita

研究成果: Article査読

81 被引用数 (Scopus)


Inspired by the chromo-natural inflation model of Adshead&Wyman, we reshape its scalar content to relax the tension with current observational bounds. Besides an inflaton, the setup includes a spectator sector in which an axion and SU(2) gauge fields are coupled via a Chern-Simons-type term. The result is a viable theory endowed with an alternative production mechanism for gravitational waves during inflation. The gravitational wave signal sourced by the spectator fields can be much larger than the contribution from standard vacuum fluctuations, it is distinguishable from the latter on the basis of its chirality and, depending on the theory parameters values, also its tilt. This production process breaks the well-known relation between the tensor-to-scalar ratio and the energy scale of inflation. As a result, even if the Hubble rate is itself too small for the vacuum to generate a tensor amplitude detectable by upcoming experiments, this model still supports observable gravitational waves.

ジャーナルJournal of Cosmology and Astroparticle Physics
出版ステータスPublished - 2017 1月 11

ASJC Scopus subject areas

  • 天文学と天体物理学


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