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Title: Validity of local thermal equilibrium in anomalous heat diffusion
Authors: Wang, L.
Liu, S. 
Li, B.
Keywords: Definition of temperature
Heat diffusion
Local thermal equilibrium
Second law of thermodynamics
Issue Date: 2019
Publisher: Institute of Physics Publishing
Citation: Wang, L., Liu, S., Li, B. (2019). Validity of local thermal equilibrium in anomalous heat diffusion. New Journal of Physics 21 (8) : 83019. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: Local thermal equilibrium (LTE) is a general presumption of many theoretical analyses in nonequilibrium statistical physics. It describes a situation that although the system is not in global thermal equilibrium, each small portion of the system may still be described approximately by the laws of thermal equilibrium. The validity of LTE has however seldom been investigated carefully. Here, by studying the ensemble velocity distribution and its spatial correlation, we present strong evidences for the lack of LTE in anomalous heat diffusion processes in one dimensional harmonic lattices and the Fermi-Pasta-Ulam-? lattices. In particular, clear nonzero excess kurtosis and long range correlations have been observed, with values scaling linearly with the initial temperature difference. Therefore near thermal equilibrium is not sufficient to achieve LTE. Some existing studies that are based on the existence of LTE should be revisited. Using the same methods, we also show that LTE is still valid in the ? 4 lattice, in which heat diffuses following Fourier's law. © 2019 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft.
Source Title: New Journal of Physics
ISSN: 1367-2630
DOI: 10.1088/1367-2630/ab34a0
Rights: Attribution 4.0 International
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