Collective motion of self-propelled particles interacting without cohesion

Hugues Chate, Francesco Ginelli, Guillaume Gregoire, Franck Raynaud

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365 Citations (Scopus)

Abstract

We present a comprehensive study of Vicsek-style self-propelled particle models in two and three space dimensions. The onset of collective motion in such stochastic models with only local alignment interactions is studied in detail and shown to be discontinuous (first-order-like). The properties of the ordered, collectively moving phase are investigated. In a large domain of parameter space including the transition region, well-defined high-density and high-order propagating solitary structures are shown to dominate the dynamics. Far enough from the transition region, on the other hand, these objects are not present. A statistically homogeneous ordered phase is then observed, which is characterized by anomalously strong density fluctuations, superdiffusion, and strong intermittency.

Original languageEnglish
Article number046113
Number of pages15
JournalPhysical Review. E, Statistical, Nonlinear and Soft Matter Physics
Volume77
Issue number4
DOIs
Publication statusPublished - Apr 2008

Keywords

  • giant number fluctuations
  • phase-transition
  • animal groups
  • model
  • hydrodynamics
  • behavior
  • system
  • flocks
  • organization
  • dynamics

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