Dark matter in axion landscape

Ryuji Daido, Takeshi Kobayashi, Fuminobu Takahashi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

If there are a plethora of axions in nature, they may have a complicated potential and create an axion landscape. We study a possibility that one of the axions is so light that it is cosmologically stable, explaining the observed dark matter density. In particular we focus on a case in which two (or more) shift-symmetry breaking terms conspire to make the axion sufficiently light at the potential minimum. In this case the axion has a flat-bottomed potential. In contrast to the case in which a single cosine term dominates the potential, the axion abundance as well as its isocurvature perturbations are significantly suppressed. This allows an axion with a rather large mass to serve as dark matter without fine-tuning of the initial misalignment, and further makes higher-scale inflation to be consistent with the scenario.

Original languageEnglish
Pages (from-to)293-299
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume765
DOIs
Publication statusPublished - 2017 Feb 10

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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