Hydrodynamic flow in heavy-ion collisions with large hadronic viscosity

Journal Article · Fri Apr 15 04:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.044909· OSTI ID:21499610

Chun, Shen; Heinz, Ulrich ^[1]

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1. Department of Physics, Ohio State University, Columbus, Ohio 43210-1117 (United States)

Using the (2+1)-dimensional viscous hydrodynamic code vish2+1 with a temperature-dependent specific shear viscosity ({eta}/s)(T), we present a detailed study of the influence of a large hadronic shear viscosity and its corresponding relaxation time {tau}{sub {pi}} on the transverse momentum spectra and elliptic flow of hadrons produced in 200A GeV Au+Au collisions. Although theory, in principle, predicts a well-defined relation {tau}{sub {pi}T}={kappa}(T)x({eta}/s)(T), the precise form of {kappa}(T) for the matter created in relativistic heavy-ion collisions is not known. For the popular choice {kappa}=3 the hadron spectra are found to be insensitive to a significant rise of {eta}/s in the hadronic stage, whereas their differential elliptic flow v{sub 2}(p{sub T}) is strongly suppressed by large hadronic viscosity. The large viscous effects on v{sub 2} are strongly reduced if (as theoretically expected) {kappa}(T) is allowed to grow with decreasing temperature in the hadronic stage. This implies that, until reliable calculations of {kappa}(T) become available, an extraction of the hadronic shear viscosity from a comparison between vish2+1 and a microscopic hadron cascade or experimental data requires a simultaneous fit of ({eta}/s)(T) and {kappa}(T).

• OSTI ID: 21499610
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 83; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ATOM COLLISIONS
ATOM-ATOM COLLISIONS
COLLISIONS
COMPARATIVE EVALUATIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
EVALUATION
EXTRACTION
GEV RANGE
GEV RANGE 100-1000
GOLD
HADRONS
HEAVY ION REACTIONS
HYDRODYNAMIC MODEL
LINEAR MOMENTUM
MATHEMATICAL MODELS
METALS
NUCLEAR REACTIONS
PARTICLE MODELS
RELATIVISTIC RANGE
RELAXATION TIME
SEPARATION PROCESSES
SPECTRA
STATISTICAL MODELS
TEMPERATURE DEPENDENCE
THERMODYNAMIC MODEL
THREE-DIMENSIONAL CALCULATIONS
TRANSITION ELEMENTS
TRANSVERSE MOMENTUM
VISCOSITY