Bulletin of the American Physical Society
4th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 59, Number 10
Tuesday–Saturday, October 7–11, 2014; Waikoloa, Hawaii
Session 1WJ: Future of Hydrodynamic Modeling of Relativistic Heavy Ion Collisions |
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Chair: Stefan Bass, Duke University Room: Kona 3 |
Tuesday, October 7, 2014 9:00AM - 9:30AM |
1WJ.00001: A Standard Model for the Little Bang -- how far are we from the goal? Invited Speaker: Ulrich Heinz The Little Bangs created in ultra-relativistic heavy-ion collisions share many characteristic features with the cosmological evolution after the Big Bang. I will demonstrate how quantum fluctuations in the initial state of the Little Bang propagate via hydrodynamic evolution (supplemented by an early pre-equilibrated thermalization and a late kinetic freeze-out stage) into the experimentally observed final state, manifesting themselves as fluctuations in the final flow pattern. A harmonic analysis of the final flows, their transverse momentum dependence, their flow angles, and the correlations between them (the ``Little Bang flow fluctuation spectrum'') provides detailed information from which the spectrum of gluon fluctuations in the initial state and the transport coefficients of the quark-gluon plasma (QGP) fluid created in the collisions can be reconstructed. It will be shown that the initial state fluctuation spectrum and the QGP transport coefficients are intricately entangled in their influence on the measurable observables, and that therefore one cannot be determined without the others. I will report on the status of our efforts to quantitatively determine both initial fluctuations and transport coefficients, as well as on recently developed ideas enabling a broad spectrum of novel types of analyses that demand both additional experimental measurements and new theoretical analysis methods. [Preview Abstract] |
Tuesday, October 7, 2014 9:30AM - 10:00AM |
1WJ.00002: Understanding event-shape fluctuations via flow correlations in heavy-ion collisions at LHC Invited Speaker: Jiangyong Jia I will review the current experimental measurements of the event-by-event flow and its relation to the event-shape fluctuations in the initial state. I will discuss new types of event-shape fluctuations that should be measurable in heavy ion collisions at LHC. [Preview Abstract] |
Tuesday, October 7, 2014 10:00AM - 10:30AM |
1WJ.00003: QCD Phase Diagram -- What can we learn from Lattice and Experimental data Invited Speaker: Atsushi Nakamura QCD phase diagram is an interesting target for high energy nuclear physics because we can understand the rich insights of QCD, and can get fundamental information for compact stars. There have been long struggle and at finite temperature we are now at satisfactory stage, but at finite density still many researches and trials are continuing. In this report, we present a new approach based on the canonical partition functions, $Z_n$, where $n$ is net baryon numbers. We point out that the canonical parition functions can be obtained from high energy heavy ion collider experiments, and from the lattice QCD simulation. We present the canonical partition functions obtained from RHIC data, and recent lattice simulations. We construct higher moments, such as Kurtosis, and the Lee-Yang zeros, and discuss the QCD phase diagram. [Preview Abstract] |
Tuesday, October 7, 2014 10:30AM - 11:00AM |
1WJ.00004: COFFEE BREAK |
Tuesday, October 7, 2014 11:00AM - 11:30AM |
1WJ.00005: Recent development of hydrodynamic modeling Invited Speaker: Tetsufumi Hirano In this talk, I give an overview of recent development in hydrodynamic modeling of high-energy nuclear collisions. First, I briefly discuss about current situation of hydrodynamic modeling by showing results from the integrated dynamical approach in which Monte-Carlo calculation of initial conditions, quark-gluon fluid dynamics and hadronic cascading are combined. In particular, I focus on rescattering effects of strange hadrons on final observables. Next I highlight three topics in recent development in hydrodynamic modeling. These include (1) medium response to jet propagation in di-jet asymmetric events, (2) causal hydrodynamic fluctuation and its application to Bjorken expansion and (3) chiral magnetic wave from anomalous hydrodynamic simulations. \begin{enumerate} \item Recent CMS data suggest the existence of QGP response to propagation of jets. To investigate this phenomenon, we solve hydrodynamic equations with source term which exhibits deposition of energy and momentum from jets. We find a large number of low momentum particles are emitted at large angle from jet axis. This gives a novel interpretation of the CMS data. \item It has been claimed that a matter created even in p-p/p-A collisions may behave like a fluid. However, fluctuation effects would be important in such a small system. We formulate relativistic fluctuating hydrodynamics and apply it to Bjorken expansion. We found the final multiplicity fluctuates around the mean value even if initial condition is fixed. This effect is relatively important in peripheral A-A collisions and p-p/p-A collisions. \item Anomalous transport of the quark-gluon fluid is predicted when extremely high magnetic field is applied. We investigate this possibility by solving anomalous hydrodynamic equations. We found the difference of the elliptic flow parameter between positive and negative particles appears due to the chiral magnetic wave. \end{enumerate} Finally, I provide some personal perspective of hydrodynamic modeling of high energy nuclear collisions in the next decade. [Preview Abstract] |
Tuesday, October 7, 2014 11:30AM - 12:00PM |
1WJ.00006: Non-perturbative reorganization of viscous hydrodynamics Invited Speaker: Michael Strickland The quark-gluon plasma created in relativistic heavy ion collisions is not momentum-space isotropic in the local rest frame due to the rapid longitudinal expansion of the system. As a result, the system's pressure transverse to the beam line can be significantly different than the pressure along the beamline. Such large pressure anisotropies (related to large shear corrections) can cause severe problems for traditional viscous hydrodynamics approaches and result in e.g. negative one-particle distribution functions, negative particle pressures, etc. In this talk, I will review a recently developed framework that builds in such momentum-space anisotropies non-perturbatively at leading order and then treats deviations perturbatively. The resulting framework has been dubbed anisotropic hydrodynamics (aHydro). The aHydro framework has many nice features, e.g. (i) it has been shown that aHydro agrees with traditional viscous hydrodynamics in the limit of small anisotropies (near equilibrium), (ii) it can be used to describe the large viscosity limit in which the system is free streaming and far-from-equilibrium, (iii) it is guaranteed that the leading-order one-particle distribution and longitudinal pressure are positive, both at small and large anisotropy. [Preview Abstract] |
Tuesday, October 7, 2014 12:00PM - 12:30PM |
1WJ.00007: A Numerical Causal Viscous Hydrodynamics with a Riemann Solver Invited Speaker: Yukinao Akamatsu Hydrodynamic model is now commonly applied to the description of space-time evolution of quark-gluon matter in relativistic heavy-ion collisions. Information on initial structure as well as transport properties of the fireball are expected to be imprinted in the anisotropies of the final hadron spectra. To gain accurate information on these, it is essential to have a numerical scheme with both accuracy and stability. We develop a new algorithm for relativistic ideal fluid in the Godunov scheme using a Riemann solver for quark-gluon plasma. The Riemann solver is derived based on the solution to a Riemann problem in two-shock approximation by Mignone, Plewa, and Bodo. We incorporate this Riemann solver into the numerical scheme of causal viscous hydrodynamics by Takamoto and Inutsuka. In this talk, we will present the structure of our algorithms and show some results of numerical tests. We also propose a method to measure the intrinsic artificial viscosity of each numerical scheme. [Preview Abstract] |
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