Speaker
Description
Dark photons are well-motivated hypothetical gauge particles of a hidden U(1) symmetry, which is an extension of the standard model. As ultralight bosons, dark photons can either constitute wavelike dark matter candidates, or form a relativistic background through the decay from dark matter. Through the kinetic mixing with electromagnetic photons, dark photons can induce an effective current in an SRF cavity, which will be significantly amplified because of the extremely high quality factor of SRF cavities. We conducted the first scan search for dark photon dark matter with SRF cavities, and got the most stringent limit in most of the exclusion parameter space. The dataset can also be used to constrain the relativistic dark photon background through the signal modulation arising from the Earth rotation. We also propose a multi-mode system that can enhance the sensitivity of the off-resonance region and significantly boost the scan search of dark photons. Such a system is compatible with any resonant search with electromagnetic systems for dark photons, axions and gravitational waves, and can possibly realize simultaneous resonant and broadband detection.
