Inflaxion Dark Matter

Abstract

A new mechanism for producing axion dark matter is proposed. By invoking low-scale inflation and a kinetic mixing between the axion and the inflaton, it is shown that the axion is driven to a field point slightly displaced from the potential minimum, which can give rise to the observed dark matter abundance. In this framework, different combinations of the axion and inflaton fields play various cosmological roles, including generating the cosmological perturbations, reheating the universe, and serving as dark matter. The kinetic mixing also relates the dark matter lifetime with the reheating temperature. The mechanism tames axions that would otherwise overdominate the universe, and thus opens up new windows in the axion parameter space, including decay constants at the GUT scale and higher.

arXiv comment26 pages, 4 figures, v2: published in JHEP

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• Power spectrum of domain-wall network and its implications for isotropic and anisotropic cosmic birefringence
• Challenges for heavy QCD axion inflation
• Strong CP problem and axion dark matter with small instantons
• Trapping Effect for QCD Axion Dark Matter
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• Reheating-Induced Axion Dark Matter After Low Scale Inflation
• Resolving the QCD Axion Domain Wall Problem with a Light Axion
• Impact of Helical Electromagnetic Fields on the Axion Window