title: Temperature in nonequilibrium systems with conserved energy.
abstract: 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.
authors.affiliation: Department of Theoretical Physics, University of Geneva, CH-1211 Geneva 4, Switzerland.
authors.forename: Eric
authors.initials: E
authors.lastname: Bertin
authors.forename: Olivier
authors.initials: O
authors.lastname: Dauchot
authors.forename: Michel
authors.initials: M
authors.lastname: Droz