Self-propulsion and self-navigation: Activity is a precursor to jamming

Abstract

Traffic jams are an everyday hindrance to transport, and typically arise when many vehicles have the same or a similar destination. We show, however, that even when uniformly distributed in space and uncorrelated, targets have a crucial effect on transport. At modest densities an instability arises leading to jams with emergent correlations between the targets. By considering limiting cases of the dynamics which map onto active Brownian particles, we argue that motility induced phase separation is the precursor to jams. That is, jams are MIPS seeds that undergo an extra instability due to target accumulation. This provides a quantitative prediction of the onset density for jamming, and suggests how jamming might be delayed or prevented. We study the transition between jammed and flowing phase, and find that transport is most efficient on the cusp of jamming.

arXiv comment18 pages, 22 figures. Ancillary files available

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Cited by in corpus (5)

• Entropons as collective excitations in active solids
• A geometric condition for robot-swarm cohesion and cluster-flock transition
• Emergent Synchronization and Flocking in Purely Repulsive Self-Navigating Particles
• Inhomogeneous entropy production in active crystals with point imperfections
• Noise-enabled goal attainment in crowded collectives