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Do current-density nonlinearities cut off the glass transition?

M E Cates1, Sriram Ramaswamy

  • 1SUPA, School of Physics, University of Edinburgh, JCMB Kings Buildings, Edinburgh EH9 3JZ, United Kingdom.

Physical Review Letters
|May 23, 2006
PubMed
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Nonlinear current-density couplings do not resolve the ideal glass transition in dense fluids. Instead, activated processes become dominant near the glass transition, causing memory functions to linearize.

Area of Science:

  • Condensed matter physics
  • Statistical mechanics
  • Rheology

Background:

  • Standard mode-coupling theory predicts an ideal glass transition in dense fluids.
  • This transition is singular and arises from ignoring nonlinear current-density couplings.

Purpose of the Study:

  • To investigate the role of nonlinear current-density couplings in dense fluid dynamics.
  • To determine the mechanism responsible for the cutoff of the ideal glass transition.

Main Methods:

  • Analysis of extended mode-coupling theories.
  • Schematic discussion of activated processes and their effect on memory functions.

Main Results:

  • Nonlinear current-density couplings are found to be negligible near the glass transition.

Related Experiment Videos

  • Activated processes, not couplings, are responsible for cutting off the ideal glass transition.

    • Conclusions:

    • The ideal glass transition predicted by standard mode-coupling theory is an artifact of neglecting nonlinear couplings.
    • Activated processes play a crucial role in the glass transition dynamics of dense fluids.