A generic coupling between internal states and activity leads to activation fronts and criticality in active systems

Abstract

To understand the onset of collective motion, we investigate active systems where particles switch on and off their self-propulsion. We prove that even when the only possible transition is off$\to$on, an active 2-state system behaves as an effective 3-state system that exhibits a sharp phase transition in 1D, and critical behavior in 2D, with scale-invariant activity avalanches. The obtained results show how criticality can naturally emerge in active systems, providing insight into the way collectives distribute, process, and respond to local environmental cues.

5 pages, 3 figures

References in corpus (7)

• Statistical physics of social dynamics
• Interaction Ruling Animal Collective Behaviour Depends on Topological rather than Metric Distance: Evidence from a Field Study
• Dynamics and Steady States in excitable mobile agent systems
• Collective predator evasion: Putting the criticality hypothesis to the test
• Using Active Matter to Introduce Spatial Heterogeneity to the Susceptible-Infected-Recovered Model of Epidemic Spreading
• Reaction processes among self-propelled particles
• Epidemic processes on self-propelled particles: continuum and agent-based modelling

Cited by in corpus (1)

• Wave front propagation in the Active Coagulation Model