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Active jamming: self-propelled soft particles at high density.

Silke Henkes1, Yaouen Fily, M Cristina Marchetti

  • 1Physics Department, Syracuse University, Syracuse, New York 13244, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 21, 2011
PubMed
Summary
This summary is machine-generated.

This study numerically explores the behavior of self-propelled particles, revealing distinct liquid and jammed phases. The dynamics in the jammed phase are governed by low-frequency modes of the particle packing.

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Area of Science:

  • Soft matter physics
  • Biophysics
  • Computational modeling

Background:

  • Dense active matter systems exhibit complex behaviors relevant to biological tissues.
  • Confluent monolayers of migratory cells show emergent collective dynamics.
  • Understanding phase transitions in active matter is crucial for predicting tissue behavior.

Purpose of the Study:

  • To numerically investigate the phase diagram and dynamics of dense self-propelled particles with soft repulsive interactions.
  • To model systems inspired by in vitro experiments on cell monolayers.
  • To characterize the distinct liquid and jammed phases and their underlying dynamics.

Main Methods:

  • Numerical simulations of a two-dimensional system of self-propelled particles.
  • Analysis of particle packing fraction and self-propulsion speed.
  • Characterization of phase transitions and dynamic modes.

Main Results:

  • A phase diagram was identified with a liquid phase at low packing fraction and high speed, characterized by giant number fluctuations.
  • A jammed phase was observed at high packing fraction and low speed.
  • The dynamics within the jammed phase are controlled by low-frequency modes of the particle packing.

Conclusions:

  • Dense active matter systems can exhibit distinct liquid and jammed phases based on particle density and self-propulsion.
  • The jamming transition and dynamics are influenced by collective particle motion and interactions.
  • The findings provide insights into the physical principles governing collective cell migration and tissue formation.