Strongly Interacting Low-Viscosity Matter Created in Relativistic Nuclear Collisions
- Section for Theoretical Physics, Department of Physics, University of Bergen, Allegaten 55, 5007 Bergen (Norway)
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 (United States)
- Nuclear Theory Group and Riken Brookhaven Center, Brookhaven National Laboratory, Bldg. 510A, Upton, New York 11973 (United States)
Substantial collective flow is observed in collisions between large nuclei at BNL RHIC (Relativistic Heavy Ion Collider) as evidenced by single-particle transverse momentum distributions and by azimuthal correlations among the produced particles. The data are well reproduced by perfect fluid dynamics. A calculation of the dimensionless ratio of shear viscosity {eta} to entropy density s by Kovtun, Son, and Starinets within anti-de Sitter space/conformal field theory yields {eta}/s=({Dirac_h}/2{pi})/4{pi}k{sub B}, which has been conjectured to be a lower bound for any physical system. Motivated by these results, we show that the transition from hadrons to quarks and gluons has behavior similar to helium, nitrogen, and water at and near their phase transitions in the ratio {eta}/s. We suggest that experimental measurements can pinpoint the location of this transition or rapid crossover in QCD.
- OSTI ID:
- 20860951
- Journal Information:
- Physical Review Letters, Vol. 97, Issue 15; Other Information: DOI: 10.1103/PhysRevLett.97.152303; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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