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Disordered Collective Motion in Dense Assemblies of Persistent Particles.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • Disordered nonthermal active matter exhibits complex collective motion.
  • Competition between persistent motion and crowding influences system dynamics.

Purpose of the Study:

  • Investigate the role of polydispersity in active matter systems.
  • Analyze the emergence of collective motion under competing forces.

Main Methods:

  • Simulations of a 2D model of size-polydisperse self-propelled particles.
  • Analysis of velocity correlations and particle dynamics.

Main Results:

  • Polydispersity stabilizes homogeneous active liquids, even at high persistence.
  • Observed turbulent flows and a nonequilibrium glass transition at large densities.
  • Nature of collective motion transitions from heterogeneous to intermittent dynamics with increasing persistence.

Conclusions:

  • Size polydispersity is crucial for stabilizing active liquids in disordered systems.
  • The system exhibits a density-driven nonequilibrium glass transition.
  • Emergent collective motion shows complex temporal evolution, especially in the intermittent regime.