η(T)/s(T) AND COLLECTIVE FLOW IN CHIRAL HYDRODYNAMICS

Abstract

Using relativistic conformal hydrodynamics coupled to the linear σ model we study the evolution of matter created in heavy–ion collisions. We focus the study on the influence of the dynamics of the chiral fields on the charged-hadron elliptic flow v2 for a temperature–independent as well as for a temperature–dependent η/s that is calculated from kinetic theory. We find that v2 is not very sensitive to the coupling of chiral fields to the hydrodynamic evolution, but the temperature dependence of η/s plays a much bigger role on this observable.