Mach Cones in Viscous Matter

TL;DR

This paper uses a microscopic transport model to study how high-energy jets create Mach cone structures in viscous media, showing that low viscosity favors cone formation while higher viscosity suppresses it.

Contribution

It demonstrates the dependence of Mach cone formation on the medium's viscosity using a microscopic transport approach, providing insights into jet-medium interactions.

Findings

Low viscosity ($ta/s pprox; 0.005) leads to strong collective cone structures.

Higher viscosity ($ta/s pprox; 0.32) suppresses Mach cone formation.

Double-peak correlations are not solely due to Mach cones, influenced by head shocks.

Abstract

Employing a microscopic transport model we investigate the evolution of high energetic jets moving through a viscous medium. For the scenario of an unstoppable jet we observe a clearly strong collective behavior for a low dissipative system $\eta/s \approx 0.005$, leading to the observation of cone-like structures. Increasing the dissipation of the system to $\eta/s \approx 0.32$ the Mach Cone structure vanishes. Furthermore, we investigate jet-associated particle correlations. A double-peak structure, as observed in experimental data, is even for low-dissipative systems not supported, because of the large influence of the head shock.