Dissipative spin dynamics in relativistic matter

Using the classical description of spin degrees of freedom, we extend recent formulation of the perfect-fluid hydrodynamics for spin-polarized fluids to the case including dissipation. Our work is based on the analysis of classical kinetic equations for massive particles with spin 1/2, with the collision terms treated in the relaxation time approximation. The kinetic-theory framework determines the structure of viscous and diffusive terms and allows to explicitly calculate a complete set of new kinetic coefficients that characterize dissipative spin dynamics.

Automated summary

This study extends the recent formulation of perfect-fluid hydrodynamics for spin-polarized fluids to include dissipation, using the classical description of spin degrees of freedom. The analysis is based on classical kinetic equations for massive particles with spin 1/2, treating collision terms in the relaxation time approximation. The kinetic-theory framework allows for the calculation of a complete set of new kinetic coefficients characterizing dissipative spin dynamics.