Footprint of two-form field: Statistical anisotropy in primordial gravitational waves

Ippei Obata, Tomohiro Fujita

研究成果: Article査読

15 被引用数 (Scopus)

抄録

We study the observational signatures of a two-form field in inflationary cosmology. In our setup a two-form field is kinetically coupled to a spectator scalar field and generates sizable gravitational waves and smaller curvature perturbation. We find that the sourced gravitational waves have a distinct signature: they are always statistically anisotropic and their spherical moments are nonzero for hexadecapole and tetrahexacontapole, while the quadrupole moment vanishes. Since their amplitude can reach O(10-3) in the tensor-to-scalar ratio, we expect this novel prediction will be tested in the next generation of cosmic microwave background experiments.

本文言語English
論文番号023513
ジャーナルPhysical Review D
99
2
DOI
出版ステータスPublished - 2019 1 15
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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