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research article
Gauge Invariance of Thermal Transport Coefficients
Thermal transport coefficients are independent of the specific microscopic expression for the energy density and current from which they can be derived through the Green-Kubo formula. We discuss this independence in terms of a kind of gauge invariance resulting from energy conservation and extensivity, and demonstrate it numerically for a Lennard-Jones fluid, where different forms of the microscopic energy density lead to different time correlation functions for the heat flux, all of them, however, resulting in the same value for the thermal conductivity.
Type
research article
Web of Science ID
WOS:000382142000006
Authors
Publication date
2016
Publisher
Published in
Volume
185
Issue
1-2
Start page
79
End page
86
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
October 18, 2016
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