Gravitational couplings of intrinsic spin
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The gravitational couplings of intrinsic spin are briefly reviewed. A consequence of the Dirac equation in the exterior gravitational field of a rotating mass is considered in detail, namely, the difference in the energy of a spin-½ particle polarized vertically up and down near the surface of a rotating body is hbarΩsin θ. Here θ is the latitude and Ω = 2GJ/(c2R3), where J and R are, respectively, the angular momentum and radius of the body. It seems that this relativistic quantum gravitational effect could be measurable in the foreseeable future.
Bahram Mashhoon 2000 Class. Quantum Grav. 17 2399