Hidden axion dark matter decaying through mixing with QCD axion and the 3:5 keV X-ray line

Tetsutaro Higaki, Naoya Kitajima, Fuminobu Takahashi

研究成果: Article査読

16 被引用数 (Scopus)

抄録

Hidden axions may be coupled to the standard model particles through a kinetic or mass mixing with QCD axion. We study a scenario in which a hidden axion constitutes a part of or the whole of dark matter and decays into photons through the mixing, explaining the 3:5 keV X-ray line signal. Interestingly, the required long lifetime of the hidden axion dark matter can be realized for the QCD axion decay constant at an intermediate scale, if the mixing is sufficiently small. In such a two component dark matter scenario, the primordial density perturbations of the hidden axion can be highly non-Gaussian, leading to a possible dispersion in the X-ray line strength from various galaxy clusters and near-by galaxies. We also discuss how the parallel and orthogonal alignment of two axions affects their couplings to gauge fields. In particular, the QCD axion decay constant can be much larger than the actual Peccei-Quinn symmetry breaking.

本文言語English
論文番号004
ジャーナルJournal of Cosmology and Astroparticle Physics
2014
12
DOI
出版ステータスPublished - 2014 12 1
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学

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