MAGO2.0: Electromagnetic Cavities as Mechanical Bars for Gravitational Waves

Abstract

Superconducting cavities can operate analogously to Weber bar detectors of gravitational waves, converting mechanical to electromagnetic energy. The significantly reduced electromagnetic noise results in increased sensitivity to high-frequency signals well outside the bandwidth of the lowest mechanical resonance. In this work, we revisit such signals of gravitational waves and demonstrate that a setup similar to the existing "MAGO" prototype, operating in a scanning or broadband manner, could have sensitivity to strains of $\sim 10^{-22}-10^{-18}$ for frequencies of $\sim 10\text{kHz}-1\text{GHz}$.

23 pages + 11 pages of appendices

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• Enhanced primordial gravitational waves from a stiff post-inflationary era due to an oscillating inflaton
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• Simultaneous Resonant and Broadband Detection of Ultralight Dark Matter and High-Frequency Gravitational Waves via Cavities and Circuits
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• Hydrogen and Deuterium Tunneling in Niobium
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• Probing leptogenesis and the minimal neutrino seesaw mechanism through gravitational waves
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• A Prototype Hybrid Mode Cavity for Heterodyne Axion Detection
• Identifying the Quadrupolar Nature of Gravitational Wave Background through Space-based Missions