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Active glasses exhibit distinct aging behaviors compared to passive ones. Depending on particle persistence, they show either effective thermal aging or a two-step process involving athermal and activity-driven aging.

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Statistical Mechanics

Background:

  • Glassy features are observed in active matter like cytoplasm and colloids.
  • A key question is how active glasses differ from conventional passive glasses.

Purpose of the Study:

  • Investigate aging in a model active glass former (Kob-Andersen model).
  • Compare aging dynamics under varying particle persistence in active systems.

Main Methods:

  • Employed extensive molecular dynamics simulations.
  • Utilized a dedicated simulation method for long-time scaling regimes.
  • Studied a two-dimensional Kob-Andersen glass model with active propulsion.

Main Results:

  • Short persistence times lead to effective thermal aging.
  • Long persistence times result in a two-step aging process: athermal and activity-driven.
  • Identified distinct aging behaviors based on active forcing persistence.

Conclusions:

  • Active glasses display complex aging dynamics not seen in passive systems.
  • The persistence of active forces is a critical parameter governing aging.
  • Developed methods to access long-time scaling in active matter.