title: Absence of thermalization for systems with long-range interactions coupled to a thermal bath.
abstract: We investigate the dynamics of a small long-range interacting system, in contact with a large long-range thermal bath. Our analysis reveals the existence of striking anomalies in the energy flux between the bath and the system. In particular, we find that the evolution of the system is not influenced by the kinetic temperature of the bath, as opposed to what happens for short-range collisional systems. As a consequence, the system may get hotter also when its initial temperature is larger than the bath temperature. This observation is explained quantitatively in the framework of the collisionless Vlasov description of toy models with long-range interactions and shown to be valid whenever the Vlasov picture applies, from cosmology to plasma physics..
authors.affiliation: Center for Nonlinear Phenomena and Complex Systems, Université libre de Bruxelles, B-1050, Brussels.
authors.forename: Pierre
authors.initials: P
authors.lastname: de Buyl
authors.forename: Giovanni
authors.initials: G
authors.lastname: De Ninno
authors.forename: Duccio
authors.initials: D
authors.lastname: Fanelli
authors.forename: Cesare
authors.initials: C
authors.lastname: Nardini
authors.forename: Aurelio
authors.initials: A
authors.lastname: Patelli
authors.forename: Francesco
authors.initials: F
authors.lastname: Piazza
authors.forename: Yoshiyuki Y
authors.initials: YY
authors.lastname: Yamaguchi
mesh_terms: D007700:Kinetics; D060328:Magnetic Phenomena; D008962:Models, Theoretical; D013696:Temperature