Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2006-09-24
J. Phys. Condens. Matter 19, 205105 (2007)
Physics
Condensed Matter
Soft Condensed Matter
Paper presented at the 4th workshop on non-equilibrium phenomena in supercooled fluids, glasses and amorphous materials (17-22
Scientific paper
10.1088/0953-8984/19/20/205105
Ten "themes" of viscous liquid physics are discussed with a focus on how they point to a general description of equilibrium viscous liquid dynamics (i.e., fluctuations) at a given temperature. This description is based on standard time-dependent Ginzburg-Landau equations for the density fields, stress tensor fields, potential energy density field, and fields quantifying molecular orientations. One characteristic aspect of the theory is that density has the appearance of a non-conserved field. Another characteristic feature is long-wavelength dominance of the dynamics, which not only simplifies the theory by allowing for an ultra-local Hamiltonian (free energy), but also explains the observed general independence of chemistry. Whereas there are no long-ranged static (i.e., equal-time) correlations in the model, there are important long-ranged dynamic correlations on the alpha time scale.
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