Shear viscosity and vorticity patterns in relativistic heavy ion collisions

Abstract

We study vorticity patterns in Quark-gluon plasma (QGP) in the reaction plane (XZ) of heavy ion collisions with varying collision energies from 20 GeV to 200 GeV. The collision energy is related to the chemical potential of the thermal—statistical models that assume chemical equilibrium after the relativistic collision. We use A Multi-Phase Transport (AMPT) model to get the initial conditions of the collision. We have used different definitions of vorticity and studied the patterns with respect to collision energies and also the change in the global nature of the vorticity. We have also studied shear viscosity to entropy density ratio for various particles. It remains constant in nature over a wide range of energies. The only variation we see is at lower energies.