Gravitational Waves and Dark Photon Dark Matter from Axion Rotations

Abstract

An axion rotating in field space can produce dark photons in the early universe via tachyonic instability. This explosive particle production creates a background of stochastic gravitational waves that may be visible at pulsar timing arrays or other gravitational wave detectors. This scenario provides a novel history for dark photon dark matter. The dark photons may be warm at a level detectable in future 21-cm line surveys. For a consistent cosmology, the radial direction of the complex field containing the axion must be thermalized. We explore a concrete thermalization mechanism in detail and also demonstrate how this setup can be responsible for the generation of the observed baryon asymmetry.

47 pages, 2 figures

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• Kinetic relaxation and Bose-star formation in multicomponent dark matter- I
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• Pulsar Timing Residual induced by Wideband Ultralight Dark Matter with Spin 0, 1, 2
• One-Electron Quantum Cyclotron as a Milli-eV Dark-Photon Detector
• Cosmologically Varying Kinetic Mixing
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• Diraxiogenesis
• Axion Poltergeist
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• Detectable and defect-free dark photon dark matter
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