Initialization of hydrodynamics in relativistic heavy ion collisions with an energy-momentum transport model

2014/11/30 by V. Yu. Naboka, S. V. Akkelin, Iu. Karpenko +2
Engineering · Mathematics · Physics and Astronomy · #Atomic physics #Classical mechanics #Computational Fluid Dynamics and Aerodynamics #Elliptic flow #Energy (signal processing) #Energy flow #Energy–momentum relation #Gas Dynamics and Kinetic Theory #Glauber #Heavy ion #High-Energy Particle Collisions Research #Ion #Isotropy #Mechanics #Momentum (technical analysis) #Nuclear physics #Physics #Quantum mechanics #Scattering #Thermalisation #hep-ph #nucl-ex #nucl-th

paper · pdf · doi:10.1103/physrevc.91.014906

published as Phys. Rev. C 91 (2015) 014906 · 29 pages, 15 figures, minor changes, to be published in Phys. Rev. C

arxiv created 2015/01/14 · openalex publication_date 2015/01/21 · arxiv updated 2015/01/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

A key ingredient of hydrodynamical modeling of relativistic heavy ion collisions is thermal initial conditions, an input that is the consequence of a prethermal dynamics which is not completely understood yet. In the paper we employ a recently developed energy-momentum transport model of the prethermal stage to study influence of the alternative initial states in nucleus-nucleus collisions on flow and energy density distributions of the matter at the starting time of hydrodynamics. In particular, the dependence of the results on isotropic and anisotropic initial states is analyzed. It is found that at the thermalization time the transverse flow is larger and the maximal energy density is higher for the longitudinally squeezed initial momentum distributions. The results are also sensitive to the relaxation time parameter, equation of state at the thermalization time, and transverse profile of initial energy density distribution: Gaussian approximation, Glauber Monte Carlo profiles, etc. Also, test results ensure that the numerical code based on the energy-momentum transport model is capable of providing both averaged and fluctuating initial conditions for the hydrodynamic simulations of relativistic nuclear collisions.

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