Feasibility of single-order parameter description of equilibrium viscous liquid dynamics

Details Feasibility of single-order parameter description of equilibrium viscous liquid dynamics Feasibility of single-order parameter description of equilibrium viscous liquid dynamics

2006-11-20

arxiv.org/abs/cond-mat/0611514v3

Phys. Rev. E 77, 011201 (2008).

Physics

Condensed Matter

Soft Condensed Matter

Phys. Rev. E, in press

Scientific paper

10.1103/PhysRevE.77.011201

Molecular dynamics results for the dynamic Prigogine-Defay ratio are presented for two glass-forming liquids, thus evaluating the experimentally relevant quantity for testing whether metastable-equilibrium liquid dynamics to a good approximation are described by a single parameter. For the Kob-Andersen binary Lennard-Jones mixture as well as for an asymmetric dumbbell model liquid a single-parameter description works quite well. This is confirmed by time-domain results where it is found that energy and pressure fluctuations are strongly correlated on the alpha-time scale in the NVT ensemble; in the NpT ensemble energy and volume fluctuations similarly correlate strongly.

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