QCD axion dark matter from long-lived domain walls during matter domination

Abstract

The domain wall problem of the Peccei-Quinn mechanism can be solved if the Peccei-Quinn symmetry is explicitly broken by a small amount. Domain walls decay into axions, which may account for dark matter of the universe. This scheme is however strongly constrained by overproduction of axions unless the phase of the explicit breaking term is tuned. We investigate the case where the universe is matter-dominated around the temperature of the MeV scale and domain walls decay during this matter dominated epoch. We show how the viable parameter space is expanded.

13 pages, 2 figures

References in corpus (5)

• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• Dielectric Haloscopes: A New Way to Detect Axion Dark Matter
• A Search for Dark Matter Axions with the Orpheus Experiment
• QCD Axion Dark Matter with a Small Decay Constant
• IAXO - The International Axion Observatory

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• Discovery prospects with the Dark-photons & Axion-Like particles Interferometer
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