Elliptic flow due to radiation in heavy-ion collisions

TL;DR

This paper shows that radiation patterns alone can produce flow-like signals in heavy-ion collisions, challenging the hydrodynamic interpretation, by using a statistical model of radiating dipoles that matches experimental elliptic flow data.

Contribution

It introduces a radiation-based model to explain elliptic flow, providing an alternative to hydrodynamic explanations in heavy-ion collisions.

Findings

Radiation patterns can generate flow-like signals without hydrodynamics.

The model's elliptic asymmetry matches experimental data.

Radiating dipoles effectively reproduce observed elliptic flow.

Abstract

In this paper we demonstrate that radiation patterns could cause flow-like behaviour without any reference to hydrodynamic description. For that purpose we use a statistical ensemble of radiating dipoles, motivated by the investigation of the equivalent photon yield produced by decelerating charges. For the elliptic asymmetry factor we find a reasonable agreement with experimental data.