Strongly Interacting Low Viscosity Matter Created in Heavy Ion Collisions

Abstract

Substantial collective flow is observed in collisions between large nuclei at high energy, 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. In a separate development, calculation of the dimensionless ratio of shear viscosity eta to entropy density s by Kovtun, Son and Starinets within AdS/CFT yields eta/s = 1/4pi, and they conjectured that this is a lower bound for any physical system. It is shown 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. Therefore it is possible that experimental measurements can pinpoint the location of this transition or rapid crossover in QCD via the viscosity to entropy ratio in addition to and independently of the equation of state.

Plenary talk at Quark Matter 2006 in Shanghai

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Cited by in corpus (12)

• The nucleon thermal width due to pion-baryon loops and its contribution in Shear viscosity
• Shear Viscosity of Quark Matter
• To understand sQGP through non-topological FL model
• Nucleon Properties in the Quantized Linear Sigma Model at Finite Temperature and Chemical Potential
• Collision Thermalization of Nucleons in Relativistic Heavy-Ion Collisions
• Thermalization of quark-gluon matter with the elastic scattering of gqq, gqqbar and gqbarqbar
• The baryon mass calculation in the chiral soliton model at finite temperature and density
• The vacuum tunnelling and the crossover of deconfinement in Friedberg-Lee model
• Studying the baryon properties through chiral soliton model at finite temperature and denstity
• Mean-field approximation for the chiral soliton in a chiral phase transition
• Relativistic hydrodynamics with strangeness production
• Expanding the thermodynamical potential and the analysis of the possible phase diagram of deconfinement in FL model