Different Realizations of Cooper-Frye Sampling with Conservation Laws
arXiv:1707.07026 · doi:10.1088/1361-6471/aa90eb
Abstract
Approaches based on viscous hydrodynamics for the hot and dense stage and hadronic transport for the final dilute rescattering stage are successfully applied to the dynamic description of heavy ion reactions at high beam energies. One crucial step in such hybrid approaches is the so called particlization, the transition between the hydrodynamic description to microscopic degrees of freedom. For this purpose, individual particles are sampled on the Cooper-Frye hypersurface. In this work, 4 different realizations of sampling algorithms are compared, where three of them incorporate global conservation laws of quantum numbers in each event. The algorithms are compared within two types of scenarios: simple "box" hypersurface consisting of only one static cell and a typical particlization hypersurface for Au+Au collisions at GeV. For all algorithms the mean multiplicities (or particle spectra) remain unaffected by global conservation laws in the case of large volumes. In contrast, the fluctuations of the particle numbers are affected considerably. The fluctuations of the newly developed SPREW algorithm based on exponential weights and the recently suggested SER algorithm based on ensemble rejection are smaller than without conservation laws and agree with the expectation from the canonical ensemble. The previously applied mode sampling algorithm produces dramatically larger fluctuations, than it is expected in the corresponding microcanonical ensemble, and therefore should be avoided in fluctuation studies. This study might be of interest for investigations of particle fluctuations and correlations, e.g. the suggested signatures for a phase transition or a critical endpoint, in hybrid approaches that are affected by global conservation laws.
arXiv comment11 pages, 8 figures, version accepted to publication in Journal of Physics G
References in corpus (29)
- QCD Equation of State and Hadron Resonance Gas
- Applying Bayesian parameter estimation to relativistic heavy-ion collisions: simultaneous characterization of the initial state and quark-gluon plasma medium
- 200 A GeV Au+Au collisions serve a nearly perfect quark-gluon liquid
- Energy Dependence of Moments of Net-proton Multiplicity Distributions at RHIC
- Hadronic dissipative effects on elliptic flow in ultrarelativistic heavy-ion collisions
- Fully integrated transport approach to heavy ion reactions with an intermediate hydrodynamic stage
- The importance of the bulk viscosity of QCD in ultrarelativistic heavy-ion collisions
- Higher Moments of Net-proton Multiplicity Distributions at RHIC
- Event-by-Event Simulation of the Three-Dimensional Hydrodynamic Evolution from Flux Tube Initial Conditions in Ultrarelativistic Heavy Ion Collisions
- Space-time evolution of bulk QCD matter
- Dynamics of Hot Bulk QCD Matter: from the Quark-Gluon Plasma to Hadronic Freeze-Out
- Particlization in hybrid models
- Constraining the Eq. of State of Super-Hadronic Matter from Heavy-Ion Collisions
- Estimation of the shear viscosity at finite net-baryon density from A+A collision data at GeV
- A fully dynamical simulation of central nuclear collisions
- Integrated Dynamical Approach to Relativistic Heavy Ion Collisions
- Initial conditions for hydrodynamics from weakly coupled pre-equilibrium evolution
- Quantifying properties of hot and dense QCD matter through systematic model-to-data comparison
- 3-D Glasma initial state for relativistic heavy ion collisions
- Analytical and numerical Gubser solutions of the second-order hydrodynamics
- Longitudinal Decorrelation of Anisotropic Flows in Heavy-ion Collisions at the CERN Large Hadron Collider
- Deviations of the Energy-Momentum Tensor from Equilibrium in the Initial State for Hydrodynamics from Transport Approaches
- Influence of the hadronic phase on observables in ultrarelativistic heavy ion collisions
- Event simulation based on three-fluid hydrodynamics for collisions at energies available at the Dubna Nuclotron-based Ion Collider Facility and at the Facility for Antiproton and Ion Research in Darmstadt
- Charge conservation and the shape of the ridge of two-particle correlations in relativistic heavy-ion collisions
- MUSIC with the UrQMD Afterburner
- Effect of finite particle number sampling on baryon number fluctuations
- Multiplicity Distributions in Canonical and Microcanonical Statistical Ensembles
- Dynamical freeze-out criterion in a hydrodynamical description of Au + Au collisions at GeV and Pb + Pb collisions at GeV
Cited by in corpus (14)
- Pseudorapidity distribution and decorrelation of anisotropic flow within CLVisc hydrodynamics
- Multi-particle and charge-dependent azimuthal correlations in heavy-ion collisions at the Relativistic Heavy-Ion Collider
- The QCD phase diagram and Beam Energy Scan physics: a theory overview
- Particlization with local event-by-event conservation laws
- Particlization of an interacting hadron resonance gas with global conservation laws for event-by-event fluctuations in heavy-ion collisions
- Effects of local event-by-event conservation laws in ultra-relativistic heavy ion collisions at the particlization
- Correcting event-by-event fluctuations in heavy-ion collisions for exact global conservation laws with the generalized subensemble acceptance method
- The applicability of hydrodynamics in heavy ion collisions at = 2.4-7.7 GeV
- Universal scaling of the sigma field and net-protons from Langevin dynamics of model A
- Non-critical fluctuations of (net) charges and (net) protons from iEBE-VISHNU hybrid model
- Differential two-particle number and momentum correlations with the AMPT, UrQMD, and EPOS models in Pb-Pb collisions at = 2.76 TeV
- Cooper-Frye sampling with short-range repulsion
- The BEST framework for the search for the QCD critical point and the chiral magnetic effect
- Thermal fluctuations on the freeze-out surface of heavy-ion collisions and their impact on particle correlations