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Heterodyne Broadband Detection of Axion Dark Matter
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We propose a new broadband search strategy for ultralight axion dark matter that interacts with electromagnetism. An oscillating axion field induces transitions between two quasi-degenerate resonant modes of a superconducting cavity. In two broadband runs optimized for high and low masses, this setup can probe unexplored parameter space for axion-like particles covering fifteen orders of magnitude in mass, including astrophysically long-ranged fuzzy dark matter.
Forward citations
Cited by 4 Pith papers
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Suppressed Quantum Effects of Weakly Coupled Waves
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In a hierarchical multi-axion theory with random couplings, axion field ranges shrink with 1/sqrt(N), generic axion–SM couplings are suppressed, but the QCD axion's coupling is unsuppressed.
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Cavity Multimodes as an Array for High-Frequency Gravitational Waves
A 9-cell microwave cavity's 18 modes can act as a synthetic detector array that reconstructs the direction, polarization, and chirp of a high-frequency gravitational-wave signal.
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Dark Matter Nuclear Magnetic Resonance is Sensitive to Dark Photons and the Axion-Photon Coupling
CASPEr-Gradient, an NMR axion search, could simultaneously probe dark photon kinetic mixing to about 3e-16 and axion-photon coupling to about 2e-16 GeV^-1 near a mass of 1 micro-eV.
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