Resonant conversions of QCD axions into hidden axions and suppressed isocurvature perturbations

研究成果: Article査読

24 被引用数 (Scopus)

抄録

We study in detail MSW-like resonant conversions of QCD axions into hidden axions, including cases where the adiabaticity condition is only marginally satisfied, and where anharmonic effects are non-negligible. When the resonant conversion is efficient, the QCD axion abundance is suppressed by the hidden and QCD axion mass ratio. We find that, when the resonant conversion is incomplete due to a weak violation of the adiabaticity, the CDM isocurvature perturbations can be significantly suppressed, while non-Gaussianity of the isocurvature perturbations generically remain unsuppressed. The isocurvature bounds on the inflation scale can therefore be relaxed by the partial resonant conversion of the QCD axions into hidden axions.

本文言語English
論文番号032
ジャーナルJournal of Cosmology and Astroparticle Physics
2015
1
DOI
出版ステータスPublished - 2015 1月 1

ASJC Scopus subject areas

  • 天文学と天体物理学

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