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Relativistic spin hydrodynamics with torsion and linear response theory for spin relaxation

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arxiv 2107.14231 v2 pith:GX4B4QG5 submitted 2021-07-29 hep-th cond-mat.mes-hallcond-mat.stat-mechhep-phnucl-th

Relativistic spin hydrodynamics with torsion and linear response theory for spin relaxation

classification hep-th cond-mat.mes-hallcond-mat.stat-mechhep-phnucl-th
keywords spinhydrodynamicsmodesrelaxationdensitylinearnon-hydrodynamicrelativistic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Using the second law of local thermodynamics and the first-order Palatini formalism, we formulate relativistic spin hydrodynamics for quantum field theories with Dirac fermions, such as QED and QCD, in a torsionful curved background. We work in a regime where spin density, which is assumed to relax much slower than other non-hydrodynamic modes, is treated as an independent degree of freedom in an extended hydrodynamic description. Spin hydrodynamics in our approach contains only three non-hydrodynamic modes corresponding to a spin vector, whose relaxation time is controlled by a new transport coefficient: the rotational viscosity. We study linear response theory and observe an interesting mode mixing phenomenon between the transverse shear and the spin density modes. We propose several field-theoretical ways to compute the spin relaxation time and the rotational viscosity, via the Green-Kubo formula based on retarded correlation functions.

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Cited by 10 Pith papers

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