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This summary is machine-generated.

Active matter systems exhibit polar patterns and topological defects. This study reveals how dumbbell interactions and rigidity influence pattern formation, domain growth, and compression in these systems.

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active dumbbellsactive matterclusteringcompressionentropy productionhexatic blurringmotility-induced phase separationpolar unitstopological defects

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Active Matter Physics

Background:

  • Polar patterns and topological defects are common in active matter.
  • Understanding their emergence and evolution is crucial for active matter research.

Purpose of the Study:

  • To investigate the emergence and evolution of polar patterns and topological defects in a polar active dumbbell system.
  • To clarify the interplay between patterns, morphology, domain growth, irreversibility, and compressibility.
  • To explore the influence of dumbbell rigidity and interaction strength.

Main Methods:

  • Numerical simulations of a polar active dumbbell system.
  • Analysis of pattern formation, domain growth, and compression effects.
  • Investigation of entropy production to characterize topological defects.

Main Results:

  • Softer interactions lead to easier sliding and compression, resulting in blurred hexatic patterns and extended polarization.
  • Inward-pointing topological defects drive cluster compression and create non-trivial density profiles.
  • Aster/spiral defects correlate with flat/increasing entropy profiles, offering a thermodynamic classification.

Conclusions:

  • Interaction strength and defect-compression dynamics significantly impact cluster evolution in active models.
  • The study provides a link between particle-based active models and continuum polar active field models.
  • Topological defects can be thermodynamically distinguished based on their associated entropy profiles.