Comment on "Aging Effects in a Lennard-Jones Glass"

TL;DR

This paper challenges previous aging models in Lennard-Jones glasses by proposing that activated dynamics scaling better describes the aging behavior observed in molecular dynamics simulations.

Contribution

It introduces an alternative aging scenario, activated dynamics scaling, that more accurately captures the non-equilibrium dynamics of Lennard-Jones glasses.

Findings

Activated dynamics scaling fits simulation data better

Different aging regime than previously proposed

Supports the importance of logarithmic time scaling in glass aging

Abstract

In a recent letter [PRL 78 (1997) 4581] Kob and Barrat reported results of their molecular dynamics simulation of the non-equilibrium dynamics of a binary Lennard-Jones glass. They propose an aging scenario in this system that is close to a t/t_w scaling behavior. In this comment we present new results and show that a different aging scenario, known under the name activated dynamics scaling [i.e. log((t+t_w)/tau)/log(t_w/tau)], describes the aging regime of this kind of glassy systems much better.