Non-Affine Displacements Below Jamming under Athermal Quasi-Static Compression

TL;DR

This study investigates the critical behavior of non-affine displacements in frictionless particles approaching jamming, revealing power-law divergences, localization, and fractal properties during athermal quasi-static compression.

Contribution

It provides new insights into the critical properties and localization of non-affine displacements near the jamming transition through extensive numerical simulations.

Findings

Squared norm of non-affine displacement diverges as a power law near jamming

Participation ratio vanishes, indicating localized displacements with fractal structure

Displacement distribution exhibits a power-law tail related to fractal dimension

Abstract

Critical properties of frictionless spherical particles below jamming are studied using extensive numerical simulations, paying particular attention to the non-affine part of the displacements during the athermal quasi-static compression. It is shown that the squared norm of the non-affine displacement exhibits a power-law divergence toward the jamming transition point. A possible connection between this critical exponent and that of the shear viscosity is discussed. The participation ratio of the displacements vanishes in the thermodynamic limit at the transition point, meaning that the non-affine displacements are localized marginally with a fractal dimension. Furthermore, the distribution of the displacement is shown to have a power-law tail, the exponent of which is related to the fractal dimension.