Gravitational wave trispectrum in the axion-SU(2) model

Tomohiro Fujita, Kai Murai, Ippei Obata, Maresuke Shiraishi

研究成果: Article査読

抄録

We study the trispectrum of the gravitational waves (GWs) generated through the dynamics of an axionic spectator field and SU(2) gauge fields during inflation. In non-Abelian gauge theory, the gauge fields have four-point self-interactions, which induce the tree-level GW trispectrum. We formulate this type of the GW trispectrum including the non-dynamical contributions and evaluate it in the equilateral limit as a unique signal of this model. We find that the ratio of the GW trispectrum to the cube of the scalar power spectrum can be as large as O(106) in the viable parameter space, which could be captured in the CMB observations.

本文言語English
論文番号007
ジャーナルJournal of Cosmology and Astroparticle Physics
2022
1
DOI
出版ステータスPublished - 2022 1月
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学

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