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Fluctuation-dissipation relation in a sheared fluid.

J L Barrat1, L Berthier

  • 1Département de Physique des Matériaux, Université Claude Bernard and CNRS, Villeurbanne, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 17, 2001
PubMed
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The fluctuation-dissipation theorem (FDT) is violated in driven fluids, especially in glassy states. This study reveals similarities between driven fluids and aging glassy systems, impacting our understanding of nonequilibrium physics.

Area of Science:

  • Statistical Mechanics
  • Condensed Matter Physics
  • Nonlinear Dynamics

Background:

  • The fluctuation-dissipation theorem (FDT) typically breaks down in systems out of equilibrium.
  • Understanding these violations is crucial for nonequilibrium statistical mechanics.

Purpose of the Study:

  • To investigate the relationship between correlation and response functions in a fluid driven into a stationary nonequilibrium state.
  • To compare FDT violations in fluid and glassy states under external drive.

Main Methods:

  • Molecular dynamics simulations were employed to model fluid behavior.
  • Both high-temperature fluid and low-temperature glassy states were simulated.
  • Correlation and response functions were analyzed in detail.

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Main Results:

  • In the glassy state, FDT violation resembles that of aging systems without external drive.
  • In the fluid state, FDT violations emerge beyond the linear response regime.
  • These violations in the fluid state mirror those observed in the glassy state.

Conclusions:

  • The study confirms a similarity between driven fluids and glassy systems.
  • Results align with theoretical models of driven disordered systems.
  • This provides a unified perspective on FDT violation in various nonequilibrium scenarios.