title: Aging in an infinite-range Hamiltonian system of coupled rotators.
abstract: We analyze numerically the out-of-equilibrium relaxation dynamics of a long-range Hamiltonian system of N fully coupled rotators. For a particular family of initial conditions, this system is known to enter a particular regime in which the dynamic behavior does not agree with thermodynamic predictions. Moreover, there is evidence that in the thermodynamic limit, when N--> infinity is taken prior to t--> infinity, the system will never attain true equilibrium. By analyzing the scaling properties of the two-time autocorrelation function we find that, in that regime, a very complex dynamics unfolds, in which aging phenomena appear. The scaling law strongly suggests that the system behaves in a complex way, relaxing towards equilibrium through intricate trajectories. The present results are obtained for conservative dynamics, where there is no thermal bath in contact with the system.
authors.affiliation: Facultad de Matemática, Astronomía y Física, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina. mmontemu@famaf.unc.edu.ar
authors.forename: Marcelo A
authors.initials: MA
authors.lastname: Montemurro
authors.forename: Francisco A
authors.initials: FA
authors.lastname: Tamarit
authors.forename: Celia
authors.initials: C
authors.lastname: Anteneodo