The Centrality dependence of elliptic flow, the hydrodynamic limit, and the viscosity of hot QCD
Apr, 2007
4 pages
Published in:
- Phys.Rev.C 76 (2007) 024905
e-Print:
- 0704.3553 [nucl-th]
Report number:
- SPHT-T07-049
Citations per year
Abstract: (APS)
We show that the centrality and system-size dependence of elliptic flow measured at the BNL Relativistic Heavy Ion Collider (RHIC) are fully described by a simple model based on eccentricity scaling and incomplete thermalization. We argue that the elliptic flow is at least 25% below the (ideal) “hydrodynamic limit,” even for the most central Au-Au collisions. This lack of perfect equilibration allows for estimates of the effective parton cross section in the quark-gluon plasma and of its viscosity to entropy density ratio. We also show how the initial conditions affect the transport coefficients and thermodynamic quantities extracted from the data, in particular, the viscosity and the speed of sound.- 24.85.+p
- 25.75.Ld
- 12.38.Mh
- scattering: heavy ion
- gold
- elliptic flow
- dependence: impact parameter
- hydrodynamics
- multiplicity: density
- model: Glauber
References(0)
Figures(0)
Loading ...