Dissipative hydrodynamics and heavy ion collisions

TL;DR

This paper investigates the effects of minimal viscosity on the evolution and particle production in quark-gluon plasma using Israel-Stewart hydrodynamics, showing that viscosity influences temperature evolution, particle yields, and flow patterns.

Contribution

It applies second-order dissipative hydrodynamics to model QGP evolution, demonstrating how minimal viscosity impacts observable phenomena and aligns with experimental data.

Findings

Viscous effects slow down temperature evolution.

High $p_T$ particle yields increase with viscosity.

Elliptic flow decreases due to viscosity.

Abstract

Space-time evolution and subsequent particle production from minimally viscous ($\eta/s$=0.08) QGP fluid is studied using the 2nd order Israel-Stewart's theory of dissipative relativistic fluid. Compared to ideal fluid, energy density or temperature evolves slowly in viscous dynamics. Particle yield at high $p_T$ is increased. Elliptic flow on the other hand decreases in viscous dynamics. Minimally viscous QGP fluid found to be consistent with a large number of experimental data.