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We add relaxation mechanisms that mimic the effect of temperature andnon-equilibrium driving to the recently-proposed spiral model which jams at acritical density rho_c < 1. This enables us to explore unjamming by temperatureor driving at rho_c < rho < 1. We numerically calculate the relaxation time ofthe persistence function and its spatial heterogeneity. We disentangle thethree different relaxation mechanisms responsible for unjamming when varyingdensity, temperature, and driving strength, respectively. We show that thespatial scale of dynamic heterogeneity depends on density much more stronglythan on temperature and driving.

Jamming Mechanisms and Density Dependence in a Kinetically-Constrained Model