New Ideas in Axion Detection: Leveraging Axion Electrodynamics

The Strong CP problem is a fine tuning problem with the Standard Model reflecting the unexplained absence of observed CP violation in the strong sector. One proposed solution to this problem is the introduction of an additional spontaneously broken U(1) symmetry, which results in a new particle: the axion. The axion is also of interest as a potential constituent of cold dark matter. The existence of axions would lead to modifications of Maxwell's equations. Experiments to detect axions using axion-induced radiation (ADMX/HAYSTAC, MADMAX) or magnetic field oscillations (ABRACADABRA) are already operational, and in recent years there has been discussion of detecting axion-induced electric field oscillations. In this talk, I will present theoretical limitations on the ability of magnetostatic experiments to detect induced electric fields from axions with large Compton wavelength. I will also describe a possible new approach to detecting axions using superconducting RF cavities.