Aug 12 – 18, 2012
US/Eastern timezone

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Clustering of Color Sources and the Temperature Dependence of Shear Viscosity of the QGP in Central A-A Collisions at RHIC and LHC Energies

Aug 16, 2012, 4:00 PM
Regency 1/3 and Ambassador

Regency 1/3 and Ambassador

Poster Exploring the QCD phase diagram Poster Session Reception


Dr brijesh srivastava (Purdue University)


The shear to viscosity ratios ($\eta/s$) are obtained for the QGP in the context of the Color String Percolation Model (CSPM) using data produced in Au-Au collisions at $\sqrt{s_{NN}}$ = 200 A GeV at RHIC and Pb-Pb at $\sqrt{s_{NN}}$ = 2.76 TeV at LHC \cite{per}. The experimental transverse momentum spectrum is used to measure the percolation density parameter $\xi$ in Au-Au collisions (STAR)\cite{eos}. The relativistic kinetic theory relation for $\eta/s$ is evaluated using CSPM values for the temperature and the mean free path of the QGP constituents \cite{gul1}. For Pb-Pb at $\sqrt{s_{NN}}$ = 2.76 TeV, $\xi$ values are obtained from the extrapolation at RHIC energy. The value of $\eta/s$ is 0.204$\pm$ 0.020 and 0.262$\pm$0.026 at the initial temperatures of 193.6 MeV (RHIC) and 262.2 MeV (LHC), respectively. These values are 2.3 and 3.2 times the AdS/CFT conjectured lower bound $1/4\pi$ but are consistent with the theoretical estimates of strongly coupled QGP.

Primary author

Dr brijesh srivastava (Purdue University)


Dr Andy Hirsch (Purdue University) Jorge Dias de Deus (Instituto Superior Tecnico) Dr Rolf scharenberg (Purdue university) carlos Pajares (University Santiago)

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