Statistically anisotropic tensor modes from inflation

Tomohiro Fujita, Ippei Obata, Takahiro Tanaka, Shuichiro Yokoyama

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


We consider the inflationary universe with a spectator scalar field coupled to a U(1) gauge field and calculate curvature perturbation and gravitational waves (GWs). We find that the sourced GWs can be larger than the one from vacuum fluctuation and they are statistically anisotropic as well as linearly polarized. The GW power spectrum acquires higher multipole moments with respect to the angle θ between a wave number k and a background vector field as h∝ (1-cos+cos-cos) irrespective of the model parameters.

Original languageEnglish
Article number023
JournalJournal of Cosmology and Astroparticle Physics
Issue number7
Publication statusPublished - 2018 Jul 12
Externally publishedYes


  • Inflation
  • physics of the early universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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