An RF axion haloscope can enter unstable parametric resonance only for extreme axion densities or couplings, with the required cavity Q exceeding current technology by about ten orders of magnitude for standard QCD axion dark matter.
Wilczek, Problems of Strong p and t Invariance in the Presence of Instantons, Physical Review Letters 40, 279 (1978)
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Parametric Resonance in RF Axion Haloscopes
An RF axion haloscope can enter unstable parametric resonance only for extreme axion densities or couplings, with the required cavity Q exceeding current technology by about ten orders of magnitude for standard QCD axion dark matter.