Summary
In an FRW universe, the local spin density of the Dirac spinor field is subject to precession whose rate is determined by the electric-dipole density and by the absolute velocity relative to the cosmic rest system.
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Sorg, M. Spin precession and expansion of the Universe. Nuovo Cim B 109, 465–478 (1994). https://doi.org/10.1007/BF02728387
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DOI: https://doi.org/10.1007/BF02728387