UNIGE document Scientific Article
previous document  unige:13110  next document
add to browser collection

Intensive thermodynamic parameters in nonequilibrium systems

Bertin, Eric
Dauchot, Olivier
Published in Physical Review. E. 2007, vol. 75, no. 031120, p. 17 p.
Abstract Considering a broad class of steady-state nonequilibrium systems for which some additive quantities are conserved by the dynamics, we introduce from a statistical approach intensive thermodynamic parameters (ITPs) conjugated to the conserved quantities. This definition does not require any detailed balance relation to be fulfilled. Rather, the system has to satisfy a general additivity property, which holds in most of the models usually considered in the literature, including those described by a matrix product ansatz with finite matrices. The main property of these ITPs is to take equal values in two subsystems, making them a powerful tool to describe nonequilibrium phase coexistence, as illustrated on different models. We finally discuss the issue of the equalization of ITPs when two different systems are put into contact. This issue is closely related to the possibility of measuring the ITPs using a small auxiliary system, in the same way as temperature is measured with a thermometer, and points at one of the major difficulties of nonequilibrium statistical mechanics. In addition, an efficient alternative determination, based on the measure of fluctuations, is also proposed and illustrated.
Full text
Article (403 Kb) - public document Free access
(ISO format)
BERTIN, Eric et al. Intensive thermodynamic parameters in nonequilibrium systems. In: Physical Review. E, 2007, vol. 75, n° 031120, p. 17 p. https://archive-ouverte.unige.ch/unige:13110

172 hits



Deposited on : 2011-01-04

Export document
Format :
Citation style :