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Constraints on small-field axion inflation

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Title: Constraints on small-field axion inflation
Authors: Kobayashi, Tatsuo Browse this author →KAKEN DB
Oikawa, Akane Browse this author
Omoto, Naoya Browse this author
Otsuka, Hajime Browse this author
Saga, Ikumi Browse this author
Issue Date: 15-Mar-2017
Publisher: American Physical Society (APS)
Journal Title: Physical review D
Volume: 95
Issue: 6
Start Page: 63514
Publisher DOI: 10.1103/PhysRevD.95.063514
Abstract: We study general class of small-field axion inflations, which are the mixture of polynomial and sinusoidal functions suggested by the natural and axion monodromy inflations. The axion decay constants leading to the successful axion inflations are severely constrained in order not to spoil the big bang nucleosynthesis and overproduce the isocurvature perturbation originating from the QCD axion. We in turn find that the cosmologically favorable axion decay constants are typically of order the grand unification scale or the string scale, which is consistent with the prediction of closed-string axions.
Rights: ©2017 American Physical Society
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 小林 達夫

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