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Defect Line Coarsening and Refinement in Active Nematics.

Nika Kralj1, Miha Ravnik1,2, Žiga Kos1,2,3

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|April 7, 2023
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Summary
This summary is machine-generated.

This study reveals how topological defect lines coarsen and refine in 3D active nematic turbulence. We predict defect density evolution, offering insights into dynamic regime transitions in active matter.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Non-equilibrium Systems

Background:

  • Active matter systems are inherently out of equilibrium, exhibiting diverse dynamic steady states like active turbulence.
  • Understanding transitions between these dynamic states, such as excitation or damping, remains a significant challenge.

Purpose of the Study:

  • To investigate the coarsening and refinement dynamics of topological defect lines in three-dimensional (3D) active nematic turbulence.
  • To develop a phenomenological description for defect density evolution away from steady states.

Main Methods:

  • Theoretical modeling and numerical simulations were employed to analyze defect dynamics.
  • The study examined the evolution of defect density in response to time-dependent activity and viscoelastic properties.

Main Results:

  • A single length scale phenomenological description for defect line coarsening and refinement in 3D active nematics was established.
  • The approach was successfully applied to both single active defect loop growth and complex 3D defect networks.

Conclusions:

  • This work provides crucial insights into coarsening phenomena between dynamical regimes in 3D active matter.
  • The findings may offer analogies applicable to other physical systems exhibiting similar dynamic transitions.