Nekhoroshev estimates for finitely differentiable quasi-convex Hamiltonians

Abed Bounemoura (1, 2)

1 LM-Orsay - Laboratoire de Mathématiques d'Orsay
2 IMJ - Institut de Mathématiques de Jussieu

A major result concerning perturbations of integrable Hamiltonian systems is given by Nekhoroshev estimates, which ensures exponential stability of all solutions provided the system is analytic and the integrable Hamiltonian not too degenerate. In the particular but important case where the latter is quasi-convex, these exponential estimates have been generalized by Marco and Sauzin if the Hamiltonian is Gevrey regular, using a method introduced by Lochak in the analytic case. In this paper, using the same approach we will investigate the situation where the Hamiltonian is assumed to be only finitely differentiable, it is known that exponential stability does not hold but nevertheless we will prove estimates of polynomial stability.

Mots clés: Dynamical Systems; Hamiltonian Systems; Nekhoroshev theory

Domaines: Systèmes dynamiques [math.DS]

Abed Bounemoura. Nekhoroshev estimates for finitely differentiable quasi-convex Hamiltonians. Journal of Differential Equations, 2010, 249 (11), pp.2905-2920. ⟨hal-00454594v2⟩