title: Aging and fluctuation-dissipation ratio in a nonequilibrium q-state lattice model.
abstract: A generalized version of the nonequilibrium linear Glauber model with q states in d dimensions is introduced and analyzed. The model is fully symmetric, its dynamics being invariant under all permutations of the q states. Exact expressions for the two-time autocorrelation and response functions on a d-dimensional lattice are obtained. In the stationary regime, the fluctuation-dissipation theorem holds, while in the transient the aging is observed with the fluctuation-dissipation ratio leading to the value predicted for the linear Glauber model.
authors.affiliation: Instituto de Física, Universidade de São Paulo, Caixa Postal 66318, 05314-970 São Paulo, Brazil.
authors.forename: M O
authors.initials: MO
authors.lastname: Hase
authors.forename: T
authors.initials: T
authors.lastname: Tomé
authors.forename: M J
authors.initials: MJ
authors.lastname: de Oliveira