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Disordered boundaries destroy bulk phase separation in scalar active matter.

Ydan Ben Dor1, Sunghan Ro1, Yariv Kafri1

  • 1Department of Physics, Technion-Israel Institute of Technology, Haifa 3200003, Israel.

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Disordered boundaries disrupt phase separation in active systems below three dimensions, unlike equilibrium systems. This occurs due to long-ranged density correlations and eddy cascades, preventing bulk separation.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Active Matter

Background:

  • In equilibrium systems, boundaries do not affect bulk phase separation.
  • Active systems exhibit unique behaviors driven by self-propulsion.

Purpose of the Study:

  • To investigate the impact of disordered boundaries on bulk phase separation in scalar active systems.
  • To elucidate the underlying mechanisms responsible for boundary effects in active matter.

Main Methods:

  • Theoretical calculations analyzing localized wall deformations.
  • Numerical simulations of microscopic active systems.
  • Analysis of density field correlations and eddy cascades.

Main Results:

  • Disordered boundaries destroy bulk phase separation in dimensions d<3.
  • Long-ranged density correlations and eddy cascades were identified as key mechanisms.
  • These effects prevent phase separation in low-dimensional active systems.

Conclusions:

  • Disordered boundaries fundamentally alter phase separation behavior in active matter compared to equilibrium systems.
  • The findings are applicable to both dilute and interacting active systems with a unique hydrodynamic mode.
  • Theoretical predictions are robustly validated by numerical simulations.