Time dependent correlations in a supercooled liquid from nonlinear fluctuating hydrodynamics

2008/10/01 by Bhaskar Sen Gupta, Gupta, Bhaskar Sen, Shankar P. Das +3 · 1 citation
Physics and Astronomy · Materials Science · #Spectroscopy and Quantum Chemical Studies #Material Dynamics and Properties #Theoretical and Computational Physics

paper · pdf · doi:10.48550/arxiv.0810.0133

Abstract

We solve numerically the equations of nonlinear fluctuating hydrodynamics (NFH) for the supercooled liquid. The time correlation of the density fluctuations in equilibrium obtained here shows quantitative agreement with molecular dynamics(MD) simulation data. We demonstrate numerically that the 1/rho nonlinearity in the NFH equations of motion is essential in restoring the ergodic behavior in the liquid. Under nonequilibrium conditions the time correlation functions relax in a manner similar to that observed in the molecular dynamics simulations in binary mixtures. The waiting time t_w dependence of the non-equilibrium response function follows a Modified Kohlrausch-Williams-Watts(MKWW) form similar to the behavior seen in dielectric relaxation data.

Cited by

• Field-Theoretic Simulation of Dean-Kawasaki Dynamics for Interacting Particles

Related

• Signatures of dynamic heterogeneity from a generalized hydrodynamic model of the supercooled liquid
• Time-dependent four-point density correlation functions in supercooled liquids
• Fluctuating hydrodynamics approach to equilibrium time correlations for anharmonic chains
• Understanding the phenomenon of viscous slowing down of glass-forming liquids from the static pair correlation function
• Molecular Correlations in a Supercooled Liquid