CP-violating axion interactions II: axions as Dark Matter

Abstract

Axions provide a solution to the strong CP problem and are excellent dark matter candidates. The presence of additional sources of CP violation, for example to account for the matter/antimatter asymmetry of the universe, can lead to CP-violating interactions between axions and Standard Model fields. In case axions form a coherent dark matter background, this leads to time-oscillating fundamental constants such as the fine-structure constant and particle masses. In this work we compare the sensitivity of various searches for CP-odd axion interactions. These include fifth-force experiments, searches for time-oscillating constants induced by axion dark matter, and direct limits from electric dipole moment experiments. We show that searches for oscillating constants can outperform fifth-force experiments in the regime of small axion masses, but, in general, do not reach the sensitivity of electric dipole moment experiments.

v2 corresponds to the published version

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Cited by in corpus (6)

• Leading bounds on micro- to picometer fifth forces from neutron star cooling
• Cosmic Birefringence from CP-Violating Axion Interactions
• Scalarful double beta decay
• ALP contribution to the Strong CP problem
• Axion Window on New Macroscopic Forces
• Probing ALP-photon couplings in Neutron Stars: Scalar versus pseudoscalar cases