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Nonquenched rotators ease flocking and memorize it.

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Nonquenched rotators enhance flock ordering by memorizing flock information, making polar flocks more robust. This memory effect boosts sound speeds, improving information convection and flock stability.

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Area of Science:

  • Physics
  • Statistical Mechanics
  • Collective Behavior

Background:

  • Two-dimensional polar flocks exhibit macroscopic long-range order.
  • Understanding factors that enhance flock robustness is crucial for collective behavior studies.

Purpose of the Study:

  • To investigate the impact of nonquenched rotators on the ordering and robustness of a two-dimensional polar flock.
  • To develop a comprehensive hydrodynamic framework for the microscopic flock model.

Main Methods:

  • Introduction of a minimal model for a 2D polar flock with nonquenched rotators.
  • Formulation of a hydrodynamic framework for the microscopic model.
  • Application of linearized hydrodynamics to analyze system properties.

Main Results:

  • Nonquenched rotators increase the robustness of macroscopic long-range order compared to clean systems.
  • Rotators memorize flock information, aiding in robustness and probing flock movement.
  • Presence of nonquenched heterogeneities increases flock sound speeds.

Conclusions:

  • Enhanced sound speeds due to nonquenched rotators lead to faster information convection and robust ordering.
  • Nonquenched heterogeneities can be beneficial for monitoring and controlling large crowds.
  • The study provides a comprehensive understanding of flock dynamics with nonquenched rotators.