Emergent Inter-particle Interactions in Thermal Amorphous Solids

Abstract

Amorphous media at finite temperatures, be them liquids, colloids or glasses, are made of interacting particles that move chaotically due to thermal energy, colliding and scattering continuously off each other. When the average configuration in these systems relaxes only at long times, one can introduce {\em effective interactions} that keep the {\em mean positions} in mechanical equilibrium. We introduce a new framework to determine these effective force-laws that define an effective Hessian that can be employed to discuss stability properties and density of states of the amorphous system. We exemplify the approach with a thermal glass of hard spheres; these feel zero forces when not in contact and infinite forces when they touch. The present approach recaptures the effective interactions which for sufficiently dense spheres at temperature $T$ depends on the gap $h$ between spheres as $T/h$ [C. Brito and M. Wyart, Europhys. Lett. 76 149 (2006)]. In systems at lower densities or with longer microscopic interaction (say like Lennard-Jones), the emergent force laws will include ternary, quaternary and generally higher order many-body terms, even if the microscopic interactions are strictly binary.

This version now includes initial analysis of 3-body interactions

References in corpus (4)

• In Search of Colloidal Hard Spheres
• Geometric interpretation of pre-vitrification in hard sphere liquids
• A multi-axis confocal rheoscope for studying shear flow of structured fluids
• The jamming transition in high dimension: an analytical study of the TAP equations and the effective thermodynamic potential

Cited by in corpus (7)

• Assembly of hard spheres in a cylinder: a computational and experimental study
• Universal Density of Low Frequency States in Amorphous Solids at Finite Temperatures
• How Generic are the Robust Theoretical Aspects of Jamming in Hard Sphere Models?
• Higher order corrections to the effective potential close to the jamming transition in the perceptron model
• Instabilities of Time-averaged Configurations in Thermal Glasses
• Effective Forces in Thermal Amorphous Solids with Generic Interactions
• Universal Density of Low Frequency States in Silica Glass at Finite Temperatures