Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-12-02
Phys.Rev.C83:024912,2011
Physics
Nuclear Physics
Nuclear Theory
17 pages (incl. 15 figures), references updated, typos corrected. To appear in Physical Review C
Scientific paper
10.1103/PhysRevC.83.024912
A hybrid transport approach for the bulk evolution of viscous QCD matter produced in ultra-relativistic heavy-ion collisions is presented. The expansion of the dense deconfined phase of the reaction is modeled with viscous hydrodynamics while the dilute late hadron gas stage is described microscopically by the Boltzmann equation. The advantages of such a hybrid approach lie in the improved capability of handling large dissipative corrections in the late dilute phase of the reaction, including a realistic treatment of the non-equilibrium hadronic chemistry and kinetic freeze-out. By varying the switching temperature at which the hydrodynamic output is converted to particles for further propagation with the Boltzmann cascade we test the ability of the macroscopic hydrodynamic approach to emulate the microscopic evolution during the hadronic stage and extract the temperature dependence of the effective shear viscosity of the hadron resonance gas produced in the collision. We find that the extracted values depend on the prior hydrodynamic history and hence do not represent fundamental transport properties of the hadron resonance gas. We conclude that viscous fluid dynamics does not provide a faithful description of hadron resonance gas dynamics with predictive power, and that both components of the hybrid approach are needed for a quantitative description of the fireball expansion and its freeze-out.
Bass Steffen A.
Heinz Ulrich W.
Song Hui-chao
No associations
LandOfFree
Viscous QCD matter in a hybrid hydrodynamic+Boltzmann approach does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Viscous QCD matter in a hybrid hydrodynamic+Boltzmann approach, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Viscous QCD matter in a hybrid hydrodynamic+Boltzmann approach will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-512899