Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC?

Details Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC? Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC?

2007-06-11

arxiv.org/abs/0706.1522v2

Phys.Rev.Lett.99:172301,2007

Physics

Nuclear Physics

Nuclear Theory

4 pages, 5 figures; v2: matches published version, title changed by journal

Scientific paper

10.1103/PhysRevLett.99.172301

Relativistic viscous hydrodynamic fits to RHIC data on the centrality dependence of multiplicity, transverse and elliptic flow for sqrt{s}=200 GeV Au+Au collisions are presented. For Glauber-type initial conditions, while data on integrated v_2 is consistent with a ratio of viscosity over entropy density up to eta/s=0.16, data on minimum bias v_2 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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