Spin hydrodynamics -- recent developments

TL;DR

This paper reviews recent advances in spin hydrodynamics, focusing on theoretical developments, thermodynamic relations, and applicability to heavy-ion collision conditions, including near-equilibrium dynamics.

Contribution

It introduces two approaches to perfect spin hydrodynamics that yield identical thermodynamic relations and discusses their relevance to heavy-ion collision conditions.

Findings

Two approaches to perfect spin hydrodynamics are equivalent.

The theory is applicable to late-stage heavy-ion collision conditions.

Discussion of near-equilibrium spin hydrodynamics dynamics.

Abstract

After briefly touching on relativistic hydrodynamics, we provide a detailed description of recent developments in spin hydrodynamics. We discuss the theory of perfect spin hydrodynamics within two different approaches, which lead to identical generalized thermodynamic relations. We also indicate the applicability range of the theory, finding it compatible with the conditions existing in the late stages of heavy-ion collisions. Finally, we discuss the near-equilibrium dynamics.