Simple fluid with broken time reversal invariance

Abstract

We characterize a system of hard spheres with a simple collision rule that breaks time reversal symmetry, but conserves energy. The collisions lead to an a-chiral, isotropic, and homogeneous stationary state, whose properties are determined in simulations and compared to an approximate theory originally developed for elastic hard spheres. In the nonequilibrium fluid state, velocities are correlated, a phenomenon known from other nonequilibrium stationary states. The correlations are long-ranged decaying like $1/r^d$ in $d$ dimensions. Such correlations are expected on general grounds far from equilibrium and had previously been observed in driven or non-stationary systems.

arXiv comment14 pages, 17 Figures

References in corpus (10)

• Active Particles in Complex and Crowded Environments
• Scale-free correlations in bird flocks
• Macroscopic fluctuation theory
• Odd viscosity in chiral active fluids
• Time-(ir)reversibility in active matter: from micro to macro
• The nonequilibrium glassy dynamics of self-propelled particles
• Event-Driven Brownian Dynamics for Hard Spheres
• Generic long-range interactions between passive bodies in an active fluid
• Dynamics of inelastically colliding rough spheres: Relaxation of translational and rotational energy
• Time reversal symmetry breaking in two-dimensional non-equilibrium viscous fluids