Jamming Mechanisms and Density Dependence in a Kinetically-Constrained Model

Abstract

We add relaxation mechanisms that mimic the effect of temperature and non-equilibrium driving to the recently-proposed spiral model which jams at a critical density rho_c < 1. This enables us to explore unjamming by temperature or driving at rho_c < rho < 1. We numerically calculate the relaxation time of the persistence function and its spatial heterogeneity. We disentangle the three different relaxation mechanisms responsible for unjamming when varying density, temperature, and driving strength, respectively. We show that the spatial scale of dynamic heterogeneity depends on density much more strongly than on temperature and driving.

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• Driving kinetically constrained models into non-equilibrium steady states: structural and slow transport properties
• Jamming Percolation in Three Dimensions
• Accelerated relaxation and suppressed dynamic heterogeneity in a kinetically constrained (East) model with swaps
• Hydrodynamics in kinetically-constrained lattice-gas models
• Jamming and pattern formation in models of segregation
• The relation between the structure of blocked clusters and the relaxation dynamics in kinetically-constrained models
• Jamming transition of kinetically-constrained models in rectangular systems
• Jamming by Shape in Kinetically-Constrained Models
• Jamming vs. Caging in Three Dimensional Jamming Percolation
• Finite-density effects in the Fredrickson-Andersen and Kob-Andersen kinetically-constrained models
• Kinetically constrained model for gravity-driven granular flow and clogging
• Constraint relaxation leads to jamming