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Area of Science:

  • Physics
  • Complex Systems
  • Statistical Mechanics

Background:

  • Polar flocks exhibit collective motion.
  • Understanding emergent behaviors in large systems is crucial.

Purpose of the Study:

  • Investigate the impact of obstacles on polar flock dynamics.
  • Explore the emergence of new disordered phases.

Main Methods:

  • Simulations of aligning self-propelled particles.
  • Analysis of continuous-level phenomena using Boltzmann equation truncations.

Main Results:

  • A small obstacle triggers counterpropagating bands and flow reversals.
  • Interacting bands in large systems lead to chaotic dynamics and a new disordered phase.

Conclusions:

  • Polar flocks are sensitive to local perturbations.
  • The study reveals a novel disordered phase in active matter systems.