New insights from 3D simulations of heavy ion collisions

TL;DR

This paper uses 3+1D viscous hydrodynamics simulations to analyze how initial conditions, correlations, and temperature-dependent viscosity affect observables in heavy ion collisions at RHIC and LHC.

Contribution

It introduces detailed 3D hydrodynamic modeling of heavy ion collisions, emphasizing longitudinal structure and the impact of temperature-dependent shear viscosity.

Findings

Pseudo-rapidity correlations depend on initial state and microscopic correlations.

Rapidity-dependent flow harmonics are influenced by temperature-dependent shear viscosity.

Simulations reveal the importance of longitudinal dynamics in heavy ion collision observables.

Abstract

Viscous relativistic hydrodynamics in 3+1 dimensions is applied to describe heavy ion collisions at RHIC and LHC. We present calculations of observables that are sensitive to the longitudinal structure of the created system. In particular we present pseudo-rapidity correlations and demonstrate their dependence on both the initial state and short range correlations introduced via a microscopic transport description. We further demonstrate the effect of a varying temperature dependence of the shear viscosity to entropy density ratio on rapidity dependent flow harmonics.