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Active polymer behavior in two dimensions: A comparative analysis of tangential and push-pull models.

Giulia Janzen1, Juan Pablo Miranda2,3, J Martín-Roca2,3

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This study compares active filament models, finding their structural and dynamic behaviors converge at high activity levels. Adjusting for active force reveals nearly identical results across different models and configurations.

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Area of Science:

  • Soft Matter Physics
  • Polymer Science
  • Biophysics

Background:

  • Active filaments are crucial in biological self-organization and synthetic materials.
  • Understanding their behavior requires robust theoretical and computational models.
  • Existing models like tangential and push-pull offer different perspectives on filament dynamics.

Purpose of the Study:

  • To compare the structural and dynamic behaviors of active filaments in 2D using tangential and push-pull models.
  • To investigate the influence of passive end monomers on filament dynamics.
  • To bridge the gap between different active polymer frameworks.

Main Methods:

  • Simulations of active filaments in two dimensions.
  • Comparison of tangential and push-pull models, including a variant with passive end monomers.
  • Analysis of structural and dynamic properties across varying activity levels and force definitions.

Main Results:

  • All models show similar behavior at low activity.
  • Subtle differences emerge in intermediate activity regimes.
  • Behaviors converge at high activity, especially when accounting for mean active force.
  • Results are consistent across different filament configurations and bending rigidities.

Conclusions:

  • Force definitions are critical in active polymer simulations.
  • The choice of model has less impact on behavior than previously thought, particularly at high activity.
  • Insights into phase transitions in active polymer systems are provided.