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Hydrodynamics in kinetically constrained lattice-gas models

Eial Teomy and Yair Shokef
Phys. Rev. E 95, 022124 – Published 21 February 2017

Abstract

Kinetically constrained models are lattice-gas models that are used for describing glassy systems. By construction, their equilibrium state is trivial and there are no equal-time correlations between the occupancy of different sites. We drive such models out of equilibrium by connecting them to two reservoirs of different densities, and we measure the response of the system to this perturbation. We find that under the proper coarse-graining, the behavior of these models may be expressed by a nonlinear diffusion equation, with a model- and density-dependent diffusion coefficient. We find a simple approximation for the diffusion coefficient, and we show that the relatively mild discrepancy between the approximation and our numerical results arises due to non-negligible correlations that appear as the system is driven out of equilibrium, even when the density gradient is infinitesimally small. Similar correlations appear when such kinetically constrained models are driven out of equilibrium by applying a uniform external force. We suggest that these correlations are the reason for the same discrepancy between the approximate diffusion coefficient and the numerical results for a broader group of models—nongradient lattice-gas models—for which kinetically constrained models are arguably the simplest example thereof.

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  • Received 1 December 2016

DOI:https://doi.org/10.1103/PhysRevE.95.022124

©2017 American Physical Society

Physics Subject Headings (PhySH)

Statistical Physics & Thermodynamics

Authors & Affiliations

Eial Teomy1,2,* and Yair Shokef1,†

  • 1School of Mechanical Engineering and Sackler Center for Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv 69978, Israel
  • 2Department of Physics, Bar Ilan University, Ramat Gan 52900, Israel

  • *eialteom@gmail.com
  • shokef@tau.ac.il

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Issue

Vol. 95, Iss. 2 — February 2017

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