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Active matter, like bird flocks, fragments upon impact, exhibiting brittle solid-like shattering. These model flocks lack emergent surface tension, challenging material property predictions.

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Area of Science:

  • Physics
  • Materials Science
  • Complex Systems

Background:

  • Predicting active matter properties is difficult due to non-equilibrium states.
  • Standard statistical mechanics may not apply to these systems.

Purpose of the Study:

  • Investigate the surface properties of active matter, specifically model bird flocks.
  • Determine if these aggregations exhibit emergent surface tension.

Main Methods:

  • Computational study simulating self-propelled particle aggregations impacting a surface.
  • Analysis of flock fragmentation patterns and mass distributions.

Main Results:

  • Model flocks fragment into subflocks upon impact.
  • Fragmentation follows power-law mass distributions, mimicking brittle solids.
  • No emergent surface tension was observed in these active matter systems.

Conclusions:

  • Active matter aggregations can exhibit solid-like shattering behavior.
  • The lack of emergent surface tension has implications for active matter theories.
  • Further research is needed to understand the unique surface dynamics of active matter.