Universal fluctuations in the relaxation of structural glasses

TL;DR

This paper investigates whether the local dynamical heterogeneities near glass transitions exhibit universal behavior across different materials, finding strong evidence for universal fluctuation properties and scaling functions.

Contribution

The study provides the first comparative analysis showing universal fluctuation behavior in diverse glass-forming systems.

Findings

Strong evidence for universality in fluctuations

Qualitative similarity in fluctuation behavior

Remarkable agreement in scaling functions

Abstract

The presence of strong local fluctuations -- dynamical heterogeneities -- has been observed near the glass transitions of a wide variety of materials. Here we explore the possible presence of universality in those fluctuations. We compare the statistical properties of fluctuations obtained from numerical simulations of four different glass-forming systems: two polymer systems and two particle systems. We find strong evidence for universality, both in the qualitative behavior of the fluctuations and in the remarkable agreement of the scaling functions describing them.