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WS24/25 – Abstract
Wojciech Florkowski
(Institute of Theoretical Physics, Cracow)
24.10.2024
Spin hydrodynamics
A hybrid framework of spin hydrodynamics is proposed that combines the results of kinetic theory
for particles with spin 1/2 with the Israel-Stewart method of introducing non-equilibrium dynamics.
The framework of kinetic theory is used to define the perfect-fluid description that conserves baryon
number, energy, linear momentum and spin part of angular momentum. This leads to the entropy
conservation although, in the presence of spin degrees of freedom, the perfect-fluid formalism
includes extra terms whose structure is usually attributed to dissipation. The genuine dissipative
terms appear from the condition of positive entropy production in non-equilibrium processes. They
are responsible for the transfer between the spin and orbital parts of angular momentum, with the
total angular momentum being conserved.
