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

Abstract

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.

Phys. Rev. E, in press

References in corpus (2)

• Strong pressure-energy correlations in van der Waals liquids
• Single-order-parameter description of glass-forming liquids: A one-frequency test

Cited by in corpus (6)

• Pressure-energy correlations in liquids. I. Results from computer simulations
• Pressure-energy correlations in liquids. II. Analysis and consequences
• Glass-forming liquids: One or more "order" parameters?
• Density scaling of the diffusion coefficient at various pressures in viscous liquids
• Solution of the spherically symmetric linear thermoviscoelastic problem in the inertia-free limit
• Estimating the density scaling exponent of viscous liquids from specific heat and bulk modulus data