Title:Â Detecting High-Frequency Gravitational Waves with Axion Dark Matter Experiments
Abstract:Â The use of light axion dark matter experiments as high-frequency gravitational wave detectors has gained significant attention in recent years. In this talk, I discuss this idea in the context of two experiments: the Axion Longitudinal Plasma Haloscope (ALPHA) and the Broadband Reflector Experiment for Axion Detection (BREAD). ALPHA features a cavity with an internal dielectric, enabling frequency tuning of its modes and facilitating scans across a frequency range of 10 to 50 GHz. BREAD, on the other hand, features a large cylindrical cavity with an internal focusing reflector system, with sensors in the frequency range 0.05 - 200 THz. I present the sensitivity of these experiments in terms of the strain of a hypothetical source, which could be either a relic background of the early universe or an unidentified astrophysical emitter.