Dark radiation in spectator axion-gauge models

Kakizaki, Mitsuru; Ogata, Masahito; Seto, Osamu

Progress of theoretical and experimental physics, 2022, 2022(3), 033E02

Permalink : https://hdl.handle.net/2115/85068

このアイテムのアクセス数:355件（2026-01-19 02:24 集計）

ファイル	フォーマット	サイズ	閲覧回数	説明
https://doi.org/10.1093/ptep/ptac029			3

アクセス権	metadata only access
URI	https://hdl.handle.net/2115/85068
タイトル	Dark radiation in spectator axion-gauge models
著者	Kakizaki, Mitsuru ; Ogata, Masahito ; Seto, Osamu
e-Rad_Researcher 90612622 著者名 Kakizaki, Mitsuru
著者名 Ogata, Masahito
e-Rad_Researcher 40547741 著者名 Seto, Osamu
言語	英語
発行日	2022-03
出版者	Oxford University Press
収録物名	Progress of theoretical and experimental physics
巻(号)	2022(3)
ページ	033E02
抄録	In the framework of axion-gauge field models, primordial gravitational wave perturbations could be generated during the inflationary epoch from not only the quantum fluctuation of gravitons but also the dynamics of hidden gauge fields coupled with an axion field. We investigate the evolution of the axion and the gauge field of an additional hidden SU(2) gauge group and those energy densities during and after the inflation. We show that the extra radiation component of the hidden gauge bosons produced by the axion decay can be sizable in the cases where the gauge-field-sourced additional gravitational waves is subdominant. We point out that future measurements of the dark radiation energy, such as CMB-S4, can impose significant constraints on this cosmological scenario.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
PISSN	2050-3911
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1093/ptep/ptac029