Linear response theory of relativistic hydrodynamics with spin

Understand

We use linear response techniques to develop the previously proposed relativistic ideal fluid limit with a non-negligible spin density.

• We confirm previous results and obtain expressions for the microscopic transport coefficients using Kubo-like formulae and buld up the effective field theory from the computed correlation functions.
• We also confirm that polarization makes vortices aquire an effective mass via a mechanism similar to the Anderson-Higgs mechanism in superconductors.
• As speculated earlier, this could stabilize the ideal hydrodynamic limit against fluctuation-driven vortices