Arnold diffusion in arbitrary degrees of freedom and normally hyperbolic invariant cylinders

Abstract

We prove a form of Arnold diffusion in the a priori stable case. Let H0(p) + $\epsilon$H1($\theta$, p, t), $\theta$ $\in$ T n , p $\in$ B n , t $\in$ T = R/T be a nearly integrable system of arbitrary degrees of freedom n 2 with a strictly convex H0. We show that for a "generic" $\epsilon$H1, there exists an orbit ($\theta$, p)(t) satisfying p(t) -- p(0) {\textgreater} l(H1) {\textgreater} 0, where l(H1) is independent of $\epsilon$. The diffusion orbit travels along a co-dimension one resonance , and the only obstruction to our construction is a finite set of additional resonances. For the proof we use a combination geometric and variational methods, and manage to adapt tools which have recently been developed in the a priori unstable case.

arXiv commentin Acta Mathematica, Royal Swedish Academy of Sciences, Institut Mittag-Leffler, 2016, 217. arXiv admin note: text overlap with arXiv:1112.2773

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