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.
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Acknowledgments
We thank Arghavan Safavi Naini for useful discussions and encouragement. JdV acknowledges support from the Dutch Research Council (NWO) in the form of a VIDI grant. WD acknowledges support by the U.S. DOE under Grant No. DE-FG02-00ER41132.
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Plakkot, V., Dekens, W., de Vries, J. et al. CP-violating axion interactions II: axions as dark matter. J. High Energ. Phys. 2023, 12 (2023). https://doi.org/10.1007/JHEP11(2023)012
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DOI: https://doi.org/10.1007/JHEP11(2023)012