Cross-correlating signals from multiple haloscope cavities gives a modest SNR growth advantage over power summation and yields a daily modulation in the cross-correlation imaginary part that could characterize axion velocities.
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Multiple-cavities interferometric analysis for dark matter axions directional-sensitive search based on signal cross-correlation processing
Cross-correlating signals from multiple haloscope cavities gives a modest SNR growth advantage over power summation and yields a daily modulation in the cross-correlation imaginary part that could characterize axion velocities.