Phenomenology of the companion-axion model: photon couplings

Abstract

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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Cited by in corpus (6)

• The QCD Axion: A Unique Player in the Axiverse with Mixings
• Coloured gravitational instantons, the strong CP problem and the companion axion solution
• Dilaton photoproduction in a magnetic dipole field of pulsars and magnetars
• Gravitational instantons and the quality problem of the QCD axion: Facts, speculations, and statements in between
• ALP Anarchy
• Cosmology of the companion-axion model: dark matter, gravitational waves, and primordial black holes