Axion production from primordial magnetic fields

Abstract

Production of axionlike particles (ALPs) by primordial magnetic fields may have significant impacts on cosmology. We discuss the production of ALPs in the presence of the primordial magnetic fields. We find a region of the ALP mass and photon coupling which realizes the observed properties of the dark matter with appropriate initial conditions for the magnetic fields. This region may be interesting in light of recent indications for the 3.5 keV lines from galaxy clusters. For a small axion mass, a region of previously allowed parameter spaces is excluded by overproduction of ALPs as a hot/warm dark matter component. Since the abundance of ALPs strongly depends on the initial conditions of primordial magnetic fields, our results provide implications for scenarios of magnetogenesis.

7 pages, 2 figures, comments welcome; v2: extended discussions, comments and references added, matches version published in PRD

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Cited by in corpus (6)

• Implications of Gravitational-wave Production from Dark Photon Resonance to Pulsar-timing Observations and Effective Number of Relativistic Species
• Gravitational Waves from Primordial Magnetic Fields via Photon-Graviton Conversion
• Universality of linear perturbations in SU($N$)-natural inflation
• Magnetic Field Transfer From A Hidden Sector
• B-field induced mixing between Langmuir waves and axions
• Impact of Helical Electromagnetic Fields on the Axion Window