Langevin dynamics of the Lebowitz-Percus model

TL;DR

This paper investigates the off-equilibrium Langevin dynamics of the Lebowitz-Percus lattice gas model, revealing glassy behavior induced by dynamical restrictions despite the absence of disorder.

Contribution

It demonstrates that a non-disordered lattice gas model exhibits glassy dynamics and characterizes its relaxation and fluctuation-dissipation properties.

Findings

Relaxation occurs in two steps.

No anomalies in the response function.

Glassy behavior linked to domain growth dynamics.

Abstract

We revisit the hard-spheres lattice gas model in the spherical approximation proposed by Lebowitz and Percus (J. L. Lebowitz, J. K. Percus, Phys. Rev.{\ 144} (1966) 251). Although no disorder is present in the model, we find that the short-range dynamical restrictions in the model induce glassy behavior. We examine the off-equilibrium Langevin dynamics of this model and study the relaxation of the density as well as the correlation, response and overlap two-time functions. We find that the relaxation proceeds in two steps as well as absence of anomaly in the response function. By studying the violation of the fluctuation-dissipation ratio we conclude that the glassy scenario of this model corresponds to the dynamics of domain growth in phase ordering kinetics.