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Stability of motions near resonances in quasi-integrable Hamiltonian systems
Authors:Giancarlo Benettin  Giovanni Gallavotti
Institution:(1) Rutgers Hill Center, 08903 New Brunswick, New Jersey;(2) Present address: Dipartimento di Fisica dell'Università di Padova e Centro Interuniversitario di Struttura della Materia, Via F. Marzolo 8-35131, Padova, Italy;(3) Present address: Dipartimento di Matematica, II Università di Roma, Via O. Raimondo, 00173 Rome, Italy
Abstract:Nekhoroshev's theorem on the stability of motions in quasi-integrable Hamiltonian systems is revisited. At variance with the proofs already available in the literature, we explicitly consider the case of weakly perturbed harmonic oscillators; furthermore we prove the confinement of orbits in resonant regions, in the general case of nonisochronous systems, by using the elementary idea of energy conservation instead of more complicated mechanisms. An application of Nekhoroshev's theorem to the study of perturbed motions inside resonances is also provided.Partially supported by ldquoMinistere della Pubblica Istruzione.Partially supported by Grant N.S.F. DMS 85-03333 and by ldquoMinistero della Pubblica Istruzione.
Keywords:Resonances  perturbation theory  KAM theory  Hamiltonian systems
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