Cosmological perturbations of axion with a dynamical decay constant

Takeshi Kobayashi, Fuminobu Takahashi

研究成果: Article査読

1 被引用数 (Scopus)

抄録

A QCD axion with a time-dependent decay constant has been known to be able to accommodate high-scale inflation without producing topological defects or too large isocurvature perturbations on CMB scales. We point out that a dynamical decay constant also has the effect of enhancing the small-scale axion isocurvature perturbations. The enhanced axion perturbations can even exceed the periodicity of the axion potential, and thus lead to the formation of axionic domain walls. Unlike the well-studied axionic walls, the walls produced from the enhanced perturbations are not bounded by cosmic strings, and thus would overclose the universe independently of the number of degenerate vacua along the axion potential.

本文言語English
論文番号056
ジャーナルJournal of Cosmology and Astroparticle Physics
2016
8
DOI
出版ステータスPublished - 2016 8 25

ASJC Scopus subject areas

  • 天文学と天体物理学

フィンガープリント

「Cosmological perturbations of axion with a dynamical decay constant」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル