Phys. Rev. Lett. 99, 172301 (2007) [4 pages]Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC?Received 22 June 2007; published 24 October 2007 Relativistic viscous hydrodynamic fits to Brookhaven Relativistic Heavy Ion Collider data on the centrality dependence of multiplicity, transverse, and elliptic flow for √s=200 GeV Au+Au collisions are presented. For standard (Glauber-type) initial conditions, while data on the integrated elliptic flow coefficient v2 are consistent with a ratio of viscosity over entropy density up to η/s≃0.16, data on minimum bias v2 seem to favor a much smaller viscosity over entropy ratio, below the bound from the anti–de Sitter conformal field theory conjecture. Some caveats on this result are discussed. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.172301
DOI:
10.1103/PhysRevLett.99.172301
PACS:
25.75.−q, 12.38.Mh, 24.10.Nz, 25.75.Ld
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