Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC?
Abstract
Relativistic viscous hydrodynamic fits to RHIC data on the centrality dependence of multiplicity, transverse and elliptic flow for sqrts=200 GeV Au+Au collisions are presented. For Glauber-type initial conditions, while data on integrated v2 is consistent with a ratio of viscosity over entropy density up to eta/s=0.16, data on minimum bias v2 seems to favor a much smaller viscosity over entropy ratio, below the bound from the AdS/CFT conjecture. Some caveats on this result are discussed.
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