Abstract:

Based on the recent progress of the long-lived M?ssbauer state ^93mNb, a mechanism is proposed to measure the mHz gravitational waves (GWs) by using the electromagnetic (EM) response of a spinful quantum fluid. Recently, F. Sorge suggested a superconductive GW detector. Passing GWs give a beating geometrical phase between two macroscopic wave functions bounded in different anisotropic shapes. To have a sufficient sensitivity from the superconductors, the detector has to be reduced to a size of femtometers. Therefore, a nuclear-type GW detector is proposed, where the sensitivity is dramatically enhanced by introducing the characteristic nuclear size. The collective EM response from the quantum fluid allows us to read the macroscopic geometrical phase from microscopic particles. GWs ? mHz with an amplitude of 10-22 are detectable.
 
 
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