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Differential Activity-Driven Instabilities in Biphasic Active Matter.

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This summary is machine-generated.

Differential activity in contractile gels and tissues can lead to phase separation. This hydrodynamic theory explains how varying activity and mechanical properties drive instabilities and pattern formation in active mixtures.

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Area of Science:

  • Soft matter physics
  • Biophysics
  • Materials science

Background:

  • Active stresses are known to induce instabilities in biological tissues and synthetic contractile gels.
  • Understanding these instabilities is crucial for comprehending tissue morphogenesis and designing active materials.

Purpose of the Study:

  • To develop a generic hydrodynamic theory for active mixtures with differential properties.
  • To investigate the instability mechanisms driven by differential activity.
  • To characterize the resulting patterns and phase diagrams.

Main Methods:

  • Formulation of a two-phase hydrodynamic theory.
  • Analysis of linear stability for uniform mixtures.
  • Nonlinear evolution tracking of the demixing instability.
  • Phase diagram construction for emergent patterns.

Main Results:

  • Differential activity between two phases drives a demixing instability in initially uniform mixtures.
  • The nonlinear evolution leads to the formation of distinct patterns.
  • A phase diagram is established, mapping different patterns based on system parameters.

Conclusions:

  • The developed theory provides a universal framework for understanding instabilities in active contractile systems.
  • Differential activity is identified as a key mechanism for pattern formation, complementing other known drivers like differential adhesion or growth.
  • This work offers insights into the self-organization principles in active matter and biological tissues.