Temperature in nonequilibrium systems with conserved energy.
We study a class of nonequilibrium lattice models which describe local redistributions of a globally conserved energy. A particular subclass can be solved analytically, allowing us to define a temperature T(th) along the same lines as in the equilibrium microcanonical ensemble. The fluctuation-dissipation relation is explicitly found to be linear, but its slope differs from the inverse temperature T(-1)(th). A numerical renormalization group procedure suggests that, at a coarse-grained level, all models behave similarly, leading to a two-parameter description of their macroscopic properties.
Bertin
Eric
E
Department of Theoretical Physics, University of Geneva, CH-1211 Geneva 4, Switzerland.
Dauchot
Olivier
O
Droz
Michel
M