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Jamming and flocking in the restricted active Potts model.

Mintu Karmakar1, Swarnajit Chatterjee2, Matthieu Mangeat2

  • 1School of Mathematical & Computational Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India.

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Summary
This summary is machine-generated.

Volume exclusion in flocking models causes jamming and kinetic arrest. Strong exclusion, low temperature, and high activity create jams, but phase diagrams predict how to delay or dissolve them.

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Area of Science:

  • Statistical Mechanics
  • Complex Systems
  • Non-equilibrium Physics

Background:

  • Active matter systems exhibit emergent behaviors like flocking.
  • Volume exclusion is a key factor influencing particle interactions and system dynamics.
  • Understanding jamming and kinetic arrest is crucial for predicting material behavior.

Purpose of the Study:

  • To investigate jamming and kinetic arrest in a flocking model using the active Potts model (APM).
  • To explore the effects of site occupancy restriction and on-site repulsion on spatial patterns and system dynamics.
  • To identify phase boundaries and predict conditions for delaying or dissolving jams.

Main Methods:

  • Simulations of the active Potts model with volume exclusion features.
  • Analysis of self-organized spatial patterns and phase transitions.
  • Formulation and analysis of a hydrodynamic theory for the restricted APM.

Main Results:

  • Strong volume exclusion, low temperature, high activity, and large particle density facilitate jamming via motility-induced phase separation.
  • Phase diagrams were generated to delineate jammed and free-flowing phases.
  • The study provides qualitative and quantitative predictions for jam mitigation.

Conclusions:

  • Volume exclusion significantly enriches the spatial patterns and dynamics of flocking models.
  • The developed hydrodynamic theory accurately predicts key features of the microscopic model.
  • This research offers insights into controlling jamming phenomena in active matter systems.