Relativistic spin hydrodynamics with torsion and linear response theory for spin relaxation
Abstract Using the second law of local thermodynamics and the first-order Palatini formalism, we formulate h?rklype 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-hydrod