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Dense polar active fluids in a disordered environment.

Riccardo Ben Alì Zinati1, Marc Besse1, Gilles Tarjus1

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Summary
This summary is machine-generated.

Quenched disorder in active matter influences flocking transitions. Both random forces and dilution lead to a new universality class, controlled by a quenched Navier-Stokes fixed point.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • Dense polar active matter exhibits flocking transitions.
  • Quenched disorder can significantly alter system dynamics.

Purpose of the Study:

  • To investigate the impact of quenched disorder on flocking transitions in active matter.
  • To characterize the universality class and scaling behavior under disorder.

Main Methods:

  • Analysis of incompressible active particle systems with aligning interactions.
  • Inclusion of quenched random forces or random dilution (mass).
  • Perturbative renormalization group analysis to determine critical exponents.

Main Results:

  • A continuous disorder-order (flocking) transition is observed.
  • The system's scaling behavior is governed by a novel universality class.
  • This class is controlled by a quenched Navier-Stokes fixed point.
  • Both random forces and random mass belong to the same universality class.

Conclusions:

  • Quenched disorder introduces a new universality class for flocking transitions in active matter.
  • The universality class is distinct from equilibrium systems.
  • The findings provide insights into the fundamental behavior of disordered active systems.