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Area of Science:

  • Physics
  • Complex Systems
  • Statistical Mechanics

Background:

  • Studying collective dynamics of self-propelled particles is crucial for understanding emergent behaviors in biological and artificial systems.
  • Active Brownian particles (ABPs) are a key model for self-organization, but spontaneous synchronized flocking without explicit alignment is not fully understood.

Purpose of the Study:

  • To investigate the collective dynamics of repulsive homing active Brownian particles.
  • To understand the emergence of synchronized chiral flocks and topological defects in these systems.

Main Methods:

  • Simulations of repulsive homing ABPs in two-dimensional continuous space.
  • Analysis of system-wide synchronized chiral flocking behavior.
  • Development of an analogy to an off-lattice ferromagnetic XY model.

Main Results:

  • Repulsive homing ABPs form synchronized system-wide chiral flocks across various parameters, system sizes, and densities.
  • This flocking behavior is robust against noise, polydispersity, and bounding walls.
  • Dynamical topological defects are observed and can be interpreted using the ferromagnetic XY model analogy.

Conclusions:

  • Absence of explicit alignment interactions does not preclude synchronized flocking in active matter systems.
  • The study provides a framework for understanding emergent collective phenomena and topological defects in active particle systems.
  • The analogy to the XY model offers a powerful tool for interpreting the observed phases and defects.