Axions as hot and cold dark matter

Kwang Sik Jeong, Masahiro Kawasaki, Fuminobu Takahashi

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The presence of a hot dark matter component has been hinted at 3σ by a combination of the results from different cosmological observations. We examine a possibility that pseudo Nambu-Goldstone bosons account for both hot and cold dark matter components. We show that the QCD axions can do the job for the axion decay constant fa≲(1010) GeV, if they are produced by the saxion decay and the domain wall annihilation. We also investigate the cases of thermal QCD axions, pseudo Nambu-Goldstone bosons coupled to the standard model sector through the Higgs portal, and axions produced by modulus decay.

Original languageEnglish
Article number046
JournalJournal of Cosmology and Astroparticle Physics
Volume2014
Issue number2
DOIs
Publication statusPublished - 2014 Feb

Keywords

  • axions
  • dark matter theory
  • physics of the early universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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