CP-violating axion interactions II: axions as Dark Matter

Understand

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.