QCD plasma thermalization, collective flow and extraction of shear viscosity
Zhe Xu, Carsten Greiner, Horst Stoecker
TL;DR
This paper explains the rapid thermalization and elliptic flow observed in QCD matter at RHIC using a (3+1)D parton cascade model based on pQCD interactions, and estimates the shear viscosity to entropy ratio.
Contribution
It introduces a (3+1)D parton cascade model incorporating pQCD bremsstrahlung to explain QCD plasma thermalization and flow phenomena, and provides quantitative shear viscosity estimates.
Findings
Shear viscosity to entropy ratio between 0.08 and 0.15
Successful explanation of RHIC observations using pQCD-based model
Quantitative insights into QCD plasma properties
Abstract
Fast thermalization and elliptic flow of QCD matter found at the Relativistic Heavy Ion Collider (RHIC) are understood as the consequence of perturbative QCD (pQCD) interactions within a (3+1) dimensional parton cascade. The main contributions stem from pQCD-inspired bremsstrahlung. We extract the shear viscosity to entropy ratio, which is between 0.08 and 0.15.
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