Abstract
We investigate the hydrodynamic limit for weakly asymmetric simple exclusion processes in crystal lattices. We construct a suitable scaling limit by using a discrete harmonic map. As we shall observe, the quasi-linear parabolic equation in the limit is defined on a flat torus and depends on both the local structure of the crystal lattice and the discrete harmonic map. We formulate the local ergodic theorem on the crystal lattice by introducing the notion of local function bundle, which is a family of local functions on the configuration space. The ideas and methods are taken from the discrete geometric analysis to these problems. Results we obtain are extensions of ones by Kipnis, Olla and Varadhan to crystal lattices.
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Tanaka, R. Hydrodynamic Limit for Weakly Asymmetric Simple Exclusion Processes in Crystal Lattices. Commun. Math. Phys. 315, 603–641 (2012). https://doi.org/10.1007/s00220-012-1574-0
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DOI: https://doi.org/10.1007/s00220-012-1574-0