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Phenomenology of the companion-axion model: photon couplings
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We study the phenomenology of the 'companion-axion model' consisting of two coupled QCD axions. The second axion is required to rescue the Peccei-Quinn solution to the strong-CP problem from the effects of colored gravitational instantons. We investigate here the combined phenomenology of axion-axion and axion-photon interactions, recasting present and future single-axion bounds onto the companion-axion parameter space. Most remarkably, we predict that future axion searches with haloscopes and helioscopes may well discover two QCD axions, perhaps even within the same experiment.
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QCD Axion Dark Matter from level crossing with refined adiabatic condition
Adiabatic level crossing between a QCD axion and an ALP can convert ALP dark matter into QCD axion dark matter, and a beat-frequency-based adiabatic condition maps the viable parameter region.
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