Experimental measurement of ultralow excited-state populations in an HBAR enables new constraints on high-frequency gravitational waves, dark matter, and wavefunction collapse models.
We use Einstein notation, where indices ij stand for spatial coordinates: x = 1, y = 2, z = 3
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Ultracold Mechanical Quantum Sensor for Tests of New Physics
Experimental measurement of ultralow excited-state populations in an HBAR enables new constraints on high-frequency gravitational waves, dark matter, and wavefunction collapse models.