Adiabatic suppression of the axion abundance and isocurvature due to coupling to hidden monopoles

Masahiro Kawasaki, Fuminobu Takahashi, Masaki Yamada

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The string theory predicts many light fields called moduli and axions, which cause a cosmological problem due to the overproduction of their coherent oscillation after inflation. One of the prominent solutions is an adiabatic suppression mechanism, which, however, is non-trivial to achieve in the case of axions because it necessitates a large effective mass term which decreases as a function of time. The purpose of this paper is twofold. First, we provide an analytic method to calculate the cosmological abundance of coherent oscillation in a general situation under the adiabatic suppression mechanism. Secondly, we apply our method to some concrete examples, including the one where a string axion acquires a large effective mass due to the Witten effect in the presence of hidden monopoles.

Original languageEnglish
Article number53
JournalJournal of High Energy Physics
Volume2018
Issue number1
DOIs
Publication statusPublished - 2018 Jan 1

Keywords

  • Beyond Standard Model
  • Cosmology of Theories beyond the SM
  • Solitons Monopoles and Instantons

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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