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Area of Science:

  • Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • The jamming transition is crucial for amorphous solidification and theoretically linked to the Gardner phase's marginal stability.
  • Critical exponents of jamming are historically considered preparation-history independent.
  • The applicability of Gardner physics in nonequilibrium systems remains an open question.

Purpose of the Study:

  • To investigate the nonequilibrium dynamics of hard disks approaching the jamming transition.
  • To determine if dynamic signatures of Gardner physics can be distinguished from aging effects.
  • To establish a history-independent dynamic Gardner crossover.

Main Methods:

  • Numerical simulations of hard disk compression.
  • Employing a diverse range of preparation protocols.
  • Analyzing dynamic signatures and relaxation dynamics.

Main Results:

  • Dynamic signatures of Gardner physics were successfully disentangled from aging dynamics.
  • A generic dynamic Gardner crossover was defined, independent of the preparation history.
  • The jamming transition was consistently accessed via increasingly complex energy landscapes.

Conclusions:

  • Gardner physics is relevant in nonequilibrium jamming transitions.
  • Anomalous microscopic relaxation dynamics characterize the jamming transition.
  • Further theoretical understanding of these dynamics is required.