Intermittent relaxation and avalanches in extremely persistent active matter

Abstract

We use numerical simulations to study the dynamics of dense assemblies of self-propelled particles in the limit of extremely large, but finite, persistence times. In this limit, the system evolves intermittently between mechanical equilibria where active forces balance interparticle interactions. We develop an efficient numerical strategy allowing us to resolve the statistical properties of elastic and plastic relaxation events caused by activity-driven fluctuations. The system relaxes via a succession of scale-free elastic events and broadly distributed plastic events that both depend on the system size. Correlations between plastic events lead to emergent dynamic facilitation and heterogeneous relaxation dynamics. Our results show that dynamical behaviour in extremely persistent active systems is qualitatively similar to that of sheared amorphous solids, yet with some important differences.

Authors' accepted version for publication in Soft Matter

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• Yielding and plasticity in amorphous solids
• Long-range translational order and hyperuniformity in two-dimensional chiral active crystal
• Bringing together two paradigms of non-equilibrium: Fragile versus robust aging in driven glassy systems
• Scaling the glassy dynamics of active particles: Tunable fragility and reentrance
• Confined active particles with spatially dependent Lorentz force: an odd twist to the "best Fokker-Planck approximation"
• Sound Attenuation in Glasses
• Structural fluctuations in active glasses