Abstract
The axion electromagnetic anomaly induces an oscillating electric dipole for any static magnetic dipole. Static electric dipoles do not produce oscillating magnetic moments. This is a low-energy theorem which is a consequence of the spacetime-dependent cosmic background field of the axion in the limit that it is only locally time dependent . The electron will acquire an oscillating electric dipole of frequency and strength , 2 orders of magnitude above the nucleon, and within 4 orders of magnitude of the present standard model limit on a constant electron electric dipole moment. This may suggest sensitive new experimental venues for the axion dark-matter search.
- Received 10 April 2015
DOI:https://doi.org/10.1103/PhysRevD.91.111702
© 2015 American Physical Society