KAM Theorem for Gevrey Hamiltonians

Details KAM Theorem for Gevrey Hamiltonians KAM Theorem for Gevrey Hamiltonians

2003-05-19

arxiv.org/abs/math/0305264v1

Mathematics

Dynamical Systems

Scientific paper

We consider Gevrey perturbations $H$ of a completely integrable Gevrey Hamiltonian $H_0$. Given a Cantor set $\Omega_\kappa$ defined by a Diophantine condition, we find a family of KAM invariant tori of $H$ with frequencies $\omega\in \Omega_\kappa$ which is Gevrey smooth in a Whitney sense. Moreover, we obtain a symplectic Gevrey normal form of the Hamiltonian in a neighborhood of the union $\Lambda$ of the invariant tori. This leads to effective stability of the quasiperiodic motion near $\Lambda$.

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