Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-04-13
Phys.Rev.Lett.97:152303,2006
Physics
Nuclear Physics
Nuclear Theory
Version published in PRL
Scientific paper
10.1103/PhysRevLett.97.152303
Substantial collective flow is observed in collisions between large nuclei at 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 $\eta/s = \hbar/4\pi k_B$ 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.
Csernai Laszlo Pal
Kapusta Joseph. I.
McLerran Larry D.
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