Solving the tension between high-scale inflation and axion isocurvature perturbations

Tetsutaro Higaki, Kwang Sik Jeong, Fuminobu Takahashi

研究成果: Article

37 引用 (Scopus)

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The BICEP2 experiment determined the Hubble parameter during inflation to be about 1014 GeV. Such high inflation scale is in tension with the QCD axion dark matter if the Peccei-Quinn (PQ) symmetry remains broken during and after inflation, because too large axion isocurvature perturbations would be generated. The axion isocurvature perturbations can be suppressed if the axion acquires a sufficiently heavy mass during inflation. We show that this is realized if the PQ symmetry is explicitly broken down to a discrete symmetry and if the breaking is enhanced during inflation. We also show that, even when the PQ symmetry becomes spontaneously broken after inflation, such a temporarily enhanced PQ symmetry breaking relaxes the constraint on the axion decay constant.

元の言語English
ページ(範囲)21-26
ページ数6
ジャーナルPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
734
DOI
出版物ステータスPublished - 2014 6 27

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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