Causal dissipative hydrodynamics for heavy ion collisions

TL;DR

This paper reviews recent advances in causal dissipative hydrodynamics applied to relativistic heavy ion collisions, focusing on estimating QGP viscosity from experimental data and discussing associated uncertainties.

Contribution

It provides a summary of recent developments in causal dissipative hydrodynamics and discusses phenomenological estimates of QGP viscosity from experimental data.

Findings

QGP viscosity over entropy ratio estimated from experimental data.

Large systematic uncertainties in viscosity estimates due to initial condition uncertainties.

Discussion of universal scaling in elliptic flow.

Abstract

We briefly discuss the recent developments in causal dissipative hydrodynamic for relativistic heavy ion collisions. Phenomenological estimate of QGP viscosity over entropy ratio from several experimental data, e.g. STAR's $\phi$ meson data, centrality dependence of elliptic flow, universal scaling elliptic flow etc. are discussed. QGP viscosity, extracted from hydrodynamical model analysis can have very large systematic uncertainty due to uncertain initial conditions.