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Pré-Publication, Document De Travail Année : 2017

{KAM, $\alpha$-Gevrey regularity and the $\alpha$-Bruno-Rüssmann condition

Résumé

We prove a new invariant torus theorem, for α-Gevrey smooth Hamiltonian systems , under an arithmetic assumption which we call the α-Bruno-Rüssmann condition , and which reduces to the classical Bruno-Rüssmann condition in the analytic category. Our proof is direct in the sense that, for analytic Hamiltonians, we avoid the use of complex extensions and, for non-analytic Hamiltonians, we do not use analytic approximation nor smoothing operators. Following Bessi, we also show that if a slightly weaker arithmetic condition is not satisfied, the invariant torus may be destroyed. Crucial to this work are new functional estimates in the Gevrey class.
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Dates et versions

hal-01524853 , version 1 (18-05-2017)
hal-01524853 , version 2 (19-06-2017)

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Abed Bounemoura, Jacques Fejoz. {KAM, $\alpha$-Gevrey regularity and the $\alpha$-Bruno-Rüssmann condition. 2017. ⟨hal-01524853v1⟩
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