Search for 70 μeV Dark Photon Dark Matter with a Dielectrically-Loaded Multi-Wavelength Microwave Cavity

Abstract

Microwave cavities have been deployed to search for bosonic dark matter candidates with masses of a few $\mu$eV. However, the sensitivity of these cavity detectors is limited by their volume, and the traditionally-employed half-wavelength cavities suffer from a significant volume reduction at higher masses. ADMX-Orpheus mitigates this issue by operating a tunable, dielectrically-loaded cavity at a higher-order mode, which allows the detection volume to remain large. The ADMX-Orpheus inaugural run excludes dark photon dark matter with kinetic mixing angle $\chi >10^{-13}$ between 65.5 $\mu$eV (15.8 GHz) and 69.3 $\mu$eV (16.8GHz), marking the highest-frequency tunable microwave cavity dark matter search to date.

7 pages, 5 figure, to be submitted to PRL

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• Discovering QCD-Coupled Axion Dark Matter with Polarization Haloscopes
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• A forecast of the sensitivity of the DALI Experiment to Galactic axion dark matter
• Search for Dark Photon Dark Matter in the Mass Range 41--74 $\mu \mathrm{eV}$ using Millimeter-Wave Receiver and Radioshielding Box
• Detecting dark matter using optically trapped Rydberg atom tweezer arrays
• Dark Matter Haloscope with a Disordered Dielectric Absorber
• Resonant enhancement of axion dark matter decay
• Dark photon dark matter constraints at the Taiwan axion search experiment with haloscope