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

@article{Hongo2021RelativisticSH,
  title={Relativistic spin hydrodynamics with torsion and linear response theory for spin relaxation},
  author={Masaru Hongo and Xu-Guang Huang and Matthias Kaminski and Mikhail A. Stephanov and Ho-Ung Yee},
  journal={Journal of High Energy Physics},
  year={2021}
}
Abstract 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… 

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