Intrinsic spin couples to gravity via rotation, producing a mass-independent gravitomagnetic Stern-Gerlach force that violates free-fall universality, but at an unmeasurably small level.
Spin-of-Light Gyroscope and the Spin-Rotation Coupling
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abstract
We discuss the coupling of photon spin with rotation in connection with a recent proposal of Fedderke et al. [arXiv:2406.16178 [physics.optics]] regarding a precision gyroscope based on the intrinsic spin of light. To this end, we analyze the propagation of electromagnetic radiation in a physical system that uniformly rotates about the direction of wave propagation in the presence of an ambient medium. Finally, we consider the possibility of using this type of spin-of-light gyroscope to measure gravitomagnetic fields.
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Intrinsic spin couples to gravity via rotation, producing a mass-independent gravitomagnetic Stern-Gerlach force that violates free-fall universality, but at an unmeasurably small level.