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arXiv · 2606.30841

Nekhoroshev Theorem for time quasiperiodic perturbations of P-Steep systems

Dario Bambusi·Santiago Barbieri·Mar Giralt·Beatrice Langella
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Abstract

We prove a Nekhoroshev type result for a time quasiperiodic perturbation of an integrable Hamiltonian system. More precisely, we assume that the integrable part is analytic and fulfills a generic nondegeneracy condition introduced by Nekhoroshev and called P-Steepness. We add a small perturbation which depends in a quasiperiodic way on time (with Diophantine frequency) and prove that -- for times exponentially long with the inverse of the size $\varepsilon$ of the perturbation -- the actions of the unperturbed system remain approximately constant. The proof is based on an extension to the time dependent case of the proof {of classical Nekhoroshev's theorem} given by Guzzo, Chierchia and Benettin, which however requires new ideas in order to deal with the more complex geometry of resonances of the time dependent case.

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Dario Bambusi, Santiago Barbieri, Mar Giralt, Beatrice Langella. 2026-06-29. Nekhoroshev Theorem for time quasiperiodic perturbations of P-Steep systems. https://arxiv.org/abs/2606.30841

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