Cooling Effect of the Richtmyer-Meshkov Instability

TL;DR

This paper demonstrates through numerical simulations that the Richtmyer-Meshkov instability causes cooling in relativistic fluids, with observable effects in particle correlations, using an advanced relativistic lattice Boltzmann model.

Contribution

It introduces a novel numerical investigation of RM instability-induced cooling in relativistic fluids and links it to observable particle correlation signatures.

Findings

RM instability causes measurable cooling in relativistic fluids.

Shock wave interactions generate observable two-particle correlations.

Enhanced relativistic lattice Boltzmann model enables detailed simulations.

Abstract

We provide numerical evidence that the Richtmyer-Meshkov (RM) instability contributes to the cooling of a relativistic fluid. Due to the presence of jet particles traveling throughout the medium, shock waves are generated in the form of Mach cones. The interaction of multiple shock waves can trigger the RM instability, and we have found that this process leads to a down-cooling of the relativistic fluid. To confirm the cooling effect of the instability, shock tube Richtmyer-Meshkov instability simulations are performed. Additionally, in order to provide an experimental observable of the RM instability resulting from the Mach cone interaction, we measure the two particle correlation function and highlight the effects of the interaction. The simulations have been performed with an improved version of the relativistic lattice Boltzmann model, including general equations of state and external forces.