Tensor spectra templates for axion-gauge fields dynamics during inflation

Tomohiro Fujita, Evangelos I. Sfakianakis, Maresuke Shiraishi

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


SU(2) gauge fields can generate large gravitational waves during inflation, if they are coupled to an axion which can be either the inflaton or a spectator field. The shape of the produced tensor power spectrum h depends on the form of the axion potential. We derive analytic expressions and provide general templates for h for various types of the spectator axion potential. Furthermore, we explore the detectability of the oscillatory feature, which is present in h in the case of an axion monodromy model, by possible future CMB B-mode polarization observations.

Original languageEnglish
Article number057
JournalJournal of Cosmology and Astroparticle Physics
Issue number5
Publication statusPublished - 2019 Apr 30
Externally publishedYes


  • CMBR polarisation
  • ination
  • primordial gravitational waves (theory)

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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