On differences between even and odd anisotropic-flow harmonics in non-equilibrated systems

Abstract

To assess how anisotropic transverse flow is created in a system out of equilibrium, we compare several kinetic-theoretical models in the few-rescatterings regime. We compare the flow harmonics $v_n$ from three types of transport simulations, with either $2\to 2$ or $2\to 0$ collision kernels and in the former case allowing the particles to rescatter several times or not, and from analytical calculations neglecting the gain term of the Boltzmann equation. We find that the even flow harmonics are similar in all approaches, while the odd ones differ significantly. This suggests that while even $v_n$ harmonics may to a large extent be due to the anisotropic escape probability of particles, this is not the predominant mechanism underlying the odd $v_n$ coefficients.

arXiv commentv2: expanded version (final): new title, 18 pages, 14 figures

References in corpus (33)

• Collective flow and viscosity in relativistic heavy-ion collisions
• Flow Study in Relativistic Nuclear Collisions by Fourier Expansion of Azimuthal Particle Distributions
• Triangularity and Dipole Asymmetry in Heavy Ion Collisions
• Triangular flow in hydrodynamics and transport theory
• Hydrodynamic Models for Heavy Ion Collisions
• Mapping the hydrodynamic response to the initial geometry in heavy-ion collisions
• Event-by-event distributions of azimuthal asymmetries in ultrarelativistic heavy-ion collisions
• Small System Collectivity in Relativistic Hadron and Nuclear Collisions
• One fluid to rule them all: viscous hydrodynamic description of event-by-event central p+p, p+Pb and Pb+Pb collisions at $\sqrt{s}=5.02$ TeV
• Non linearities in the harmonic spectrum of heavy ion collisions with ideal and viscous hydrodynamics
• Elliptic Flow and HBT in non-central Nuclear Collisions
• Initial State Fluctuations and Final State Correlations in Relativistic Heavy-Ion Collisions
• Momentum spectra, anisotropic flow, and ideal fluids
• Anisotropic parton escape is the dominant source of azimuthal anisotropy in transport models
• Anisotropic parton escape is the dominant source of azimuthal anisotropy in transport models
• Flow in AA and pA as an interplay of fluid-like and non-fluid like excitations
• Mode-coupling effects in anisotropic flow in heavy-ion collisions
• Viscous Hydrodynamics and the Quark Gluon Plasma
• Anisotropic flow far from equilibrium
• Opacity dependence of elliptic flow in kinetic theory
• Azimuthal Anisotropies at High Momentum from Purely Non-Hydrodynamic Transport
• Elliptic flow in transport theory and hydrodynamics
• Development of transverse flow at small and large opacities in conformal kinetic theory
• Hexagonal flow v_6 as a superposition of elliptic v_2 and triangular v_3 flows
• Searching for small droplets of hydrodynamic fluid in proton--proton collisions at the LHC
• Azimuthal asymmetry of J/Psi suppression in non-central heavy-ion collisions
• Hydrodynamization in systems with detailed transverse profiles
• Scaling behavior of anisotropic flow harmonics in the far from equilibrium regime
• Nonlinear coupling of flow harmonics: Hexagonal flow and beyond
• Fluctuations of anisotropic flow from the finite number of rescatterings in a two-dimensional massless transport model
• Early time behavior of spatial and momentum anisotropies in kinetic theory across different Knudsen numbers
• Early time behavior of spatial and momentum anisotropies in a kinetic approach to nuclear collisions
• Anisotropic collective flow of a Lorentz gas

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