Building a testable shear viscosity across the QCD phase diagram

Abstract

Current experiments at the Relativistic Heavy Ion Collider (RHIC) are probing finite baryon densities where the shear viscosity to enthalpy ratio $\eta T/w$ of the Quark Gluon Plasma remains unknown. We use the Hadron Resonance Gas (HRG) model with the most up-to-date hadron list to calculate $\eta T/w$ at low temperatures and at finite baryon densities ${\rho }_B$. We then match $\eta T/w$ to a QCD-based shear viscosity calculation within the deconfined phase to create a table across $\left\{T,{\mu }_B\right\}$ for different cross-over and critical point scenarios at a specified location. We find that these new $\eta T/w(T,{\mu }_B)$ values would require initial conditions at significantly larger ${\rho }_B$, compared to ideal hydrodynamic trajectories, in order to reach the same freeze-out point.

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