Rattler-induced aging dynamics in jammed granular systems
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Updated: Feb 17, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
Ferdinando Giacco1, Lucilla de Arcangelis, Massimo Pica Ciamarra
1Department of Mathematics and Physics, University of Campania "Luigi Vanvitelli", Caserta, Italy. eugenio.lippiello@unicampania.it ferdinando.giacco@unicampania.it.
Abstract:
Granular materials jam when developing a network of contact forces able to resist the applied stresses. Through numerical simulations of the dynamics of the jamming process, we show that the jamming transition does not occur when the kinetic energy vanishes. Rather, as the system jams, the kinetic energy becomes dominated by rattler particles, which scatter within their cages. The relaxation of the kinetic energy in the jammed configuration exhibits a double power-law decay, which we interpret in terms of the interplay between backbone and rattler particles.
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