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Search for manifestations of spin-torsion coupling

Mariya Iv. TrukhanovaPavel AndreevYuri N. Obukhov
Dec 2022
摘要
We investigate the axial vector torsion-spin coupling effects in theframework of the Poincar\'e gauge theory of gravity with the general Yang-Millstype Lagrangian. The dynamical equations for the ``electric'' and ``magnetic''components of the torsion field variable are obtained in the general form andit is shown that the helicity density and the spin density of theelectromagnetic field appear as the physical sources. The modified Maxwell'sequations for the electromagnetic field are derived, and the electromagneticwave propagation under the action of the uniform homogeneous torsion field isconsidered. We demonstrate the Faraday effect of rotation of the polarizationfor such a wave, and establish the strong bound on the possible cosmic axialtorsion field from the astrophysical data.
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