Anisotropic flow far from equilibrium

TL;DR

This paper analytically calculates anisotropic flow in a relativistic particle mixture, showing that even a single collision per particle can generate significant elliptic flow with mass-dependent ordering.

Contribution

It introduces an analytical approach to anisotropic flow far from equilibrium in relativistic mixtures, highlighting the impact of minimal collisions.

Findings

Single collision per particle induces sizable elliptic flow

Mass ordering observed between different particle species

Analytical results match qualitative expectations of flow development

Abstract

We compute analytically the anisotropic flow in an expanding mixture of several species of relativistic massive particles. We find that a single collision per particle in average already leads to sizable elliptic flow, with mass ordering between the species.