Scaling behavior of anisotropic flow harmonics in the far from equilibrium regime

Abstract

We consider the development of anisotropic flow in an expanding system of particles undergoing very few rescatterings, using a kinetic-theoretical description with a nonlinear collision term. We derive the scaling behaviors of the harmonic coefficients $v_n$ with the initial-state eccentricities and the mean number of rescatterings, and argue that hexagonal flow $v_6$ should follow a nontrivial behavior, different from that of the lower harmonics. Our findings should be observable in experimental data for small systems.

arXiv commentpublished version

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• QCD Challenges from pp to A-A Collisions
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• Fluctuations of anisotropic flow from the finite number of rescatterings in a two-dimensional massless transport model
• A Lattice Boltzmann Method for Relativistic Rarefied Flows in (2 + 1) Dimensions
• On differences between even and odd anisotropic-flow harmonics in non-equilibrated systems
• Early time behavior of spatial and momentum anisotropies in a kinetic approach to nuclear collisions
• Early time behavior of spatial and momentum anisotropies in kinetic theory across different Knudsen numbers
• Anisotropic flow in the few collisions regime: application to bottomonia
• Collective flow in single-hit QCD kinetic theory