title: Nonequilibrium properties of the one-dimensional hard-point gas system.
abstract: We discuss the stability properties of a one-dimensional hard-point gas. We study the decay of the Loschmidt echo which describes the stability of the motion under system perturbations. We show a universal behavior in the echo decay which is intimately connected to the linear dynamical instability of the motion. In particular, in spite of such a weak instability, the asymptotic decay follows a simple exponential law.
authors.affiliation: Center for Nonlinear and Complex Systems, Universita' degli studi dell'Insubria, Via Valleggio, 11 22100 Como, Italy .
authors.forename: Giulio
authors.initials: G
authors.lastname: Casati
authors.forename: Tomaz
authors.initials: T
authors.lastname: Prosen
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Baowen
authors.initials: B
authors.lastname: Li