Large tensor non-Gaussianity from axion-gauge field dynamics

Aniket Agrawal, Tomohiro Fujita, Eiichiro Komatsu

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)


We show that an inflation model in which a spectator axion field is coupled to an SU(2) gauge field produces a large three-point function (bispectrum) of primordial gravitational waves, Bh, on the scales relevant to the cosmic microwave background experiments. The amplitude of the bispectrum at the equilateral configuration is characterized by Bh/Ph2=O(10)×ΩA-1, where ΩA is a fraction of the energy density in the gauge field and Ph is the power spectrum of gravitational waves produced by the gauge field.

Original languageEnglish
Article number103526
JournalPhysical Review D
Issue number10
Publication statusPublished - 2018 May 15
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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