Bulletin of the American Physical Society
2010 Fall Meeting of the APS Division of Nuclear Physics
Volume 55, Number 14
Tuesday–Saturday, November 2–6, 2010; Santa Fe, New Mexico
Session GC: Mini-symposium on Applications of Viscous Fluid Dynamics to RHI Collisions |
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Chair: Steffen A. Bass, Duke University Room: Sweeny C |
Friday, November 5, 2010 8:30AM - 9:06AM |
GC.00001: QGP viscosity from RHIC data -- new perspective from viscous hydrodynamics +URQMD Invited Speaker: The successes of ideal hydrodynamics in describing RHIC data at lower $p_T$ region led to the well known announcement that ``RHIC Scientists Serve Up Perfect Liquid'' (the Quark Gluon Plasma, QGP). In order to answer ``How perfect is the QGP fluid?,'' one needs to extract the QGP viscosity from experimental data. Viscous hydrodynamics is such a tool that could attack this problem and may work in regions where ideal hydrodynamics fails. In this talk, I will report recent progresses on viscous hydrodynamics and its hybrid approach (viscous hydrodynamics + hadron cascade). Then I will discuss extracting the QGP shear viscosity from RHIC data and show how the theoretical uncertainties are greatly reduced with the new hybrid approach coming out. [Preview Abstract] |
Friday, November 5, 2010 9:06AM - 9:18AM |
GC.00002: Quasi-Particle Theory of Shear and Bulk Viscosities of Hadronic Matter Joseph Kapusta, Purnendu Chakraborty A theoretical framework for the calculation of shear and bulk viscosities of hadronic matter at finite temperature is presented. The framework is based on the quasi-particle picture. It allows for an arbitrary number of hadron species with point-like interactions, and allows for both elastic and inelastic collisions. Detailed balance is ensured. The particles have temperature dependent masses arising from mean field or potential effects, which maintains self-consistency between the equation of state and the transport coefficients. As an example, we calculate the shear and bulk viscosity in the Linear Sigma Model. The ratio of shear viscosity to entropy density shows a minimum in the vicinity of a rapid crossover transition, while the ratio of bulk viscosity to entropy density shows a maximum. [Preview Abstract] |
Friday, November 5, 2010 9:18AM - 9:30AM |
GC.00003: ABSTRACT WITHDRAWN |
Friday, November 5, 2010 9:30AM - 9:42AM |
GC.00004: Modeling the Hydrodynamical Properties of the QGP at RHIC Irakli Garishvili, Ron Soltz, Scott Pratt, Micael Cheng, Andrew Glenn, Jason Newby, Loren Linden-Levy, Betty Abelev Comparisons of the RHIC data to various theoretical models suggest that the evolution of the QGP, a state of matter believed to be created in early stages of heavy ion collisions at RHIC, is qualitatively well described by hydrodynamics. However, the key properties of the QGP, such as initial temperature, $T_{init}$, and the ratio of shear viscosity to entropy density of matter, $\eta/s$, are not precisely known. To constrain these properties we have developed a multi-stage hydrodynamics/hadron cascade model of heavy ion collisions which incorporates Glauber initial state conditions, pre-equilibrium flow, the UVH2+1 viscous hydro model, Cooper-Frye freezeout, and the UrQMD hadronic cascade model. To test the sensitivity of the observables to the equation of state (EoS), we use several different EoS in the hydrodynamic evolution, including those derived from the hadron resonance gas model and lattice QCD. This framework has an ability to predict key QGP observables, such as, elliptic flow, spectra, and HBT radii for various particle species. For each set of model's input parameters $(T_{init}$, $\eta/s$ and initial flow) we perform a simultaneous comparison to spectra, elliptic flow, and HBT measured at RHIC. Based on this analysis the determinations of $T_{init}$ and $\eta/s$ will be presented. [Preview Abstract] |
Friday, November 5, 2010 9:42AM - 9:54AM |
GC.00005: Beyond Bjorken: Longitudinal Effects in Viscous Hydrodynamics Joshua Vredevoogd, Scott Pratt Boost invariant viscous hydrodynamics and ideal hydrodynamics have both proven to be useful approximations to the predictions of complete viscous hydrodynamics in relativistic hydrodynamics. However, since both shear viscosity and longitudinal extent contribute to the predictions, it is necessary to complete the task and evaluate viscous hydrodynamics without the Bjorken symmetry. We will make a preliminary comparison of the predictions of (3+1)-dimensional Israel-Stewart viscous hydrodynamics to soft observables. [Preview Abstract] |
Friday, November 5, 2010 9:54AM - 10:06AM |
GC.00006: Causal Viscous Hydrodynamic Response to High Momentum Jets Cristina Moody, Denes Molnar Particle correlations measured in A+A reactions at the Relativistic Heavy Ion Collider may be used to infer properties of the medium produced. Viscous hydrodynamic calculations are being used to model the response of the medium to high-momentum jets. We present results on the propagation of sound waves in Israel-Stewart causal viscous hydrodynamics which includes shear stress relaxation effects. [Preview Abstract] |
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