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Otherwise identical particles with differing, fixed speeds demix under time-reversible dynamics.

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Area of Science:

  • Non-equilibrium statistical mechanics
  • Complex systems dynamics

Background:

  • Demixing in systems of identical particles is a focus in non-equilibrium statistical mechanics.
  • Existing models often involve active particles or lack microscopic reversibility.

Purpose of the Study:

  • To investigate demixing in systems with time-reversible dynamics.
  • To demonstrate that microscopic reversibility is not necessary for particle demixing.

Main Methods:

  • Simulating a mixture of identical particles with two fixed, different speeds.
  • Utilizing time-reversible quasi-Newtonian dynamics.

Main Results:

  • Observed demixing transition in particles with identical properties but different speeds.
  • Demonstrated that lack of thermalization between subsystems drives the instability.

Conclusions:

  • Particle demixing can occur in time-reversible systems.
  • Lack of thermalization is the key factor for demixing, irrespective of driving or reversibility.