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arXiv 1209.2893math.DSmath-phmath.CAmath.MP
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一类非凸Hamilton函数扰动的低维不变环面

Lower-dimensional invariant tori for perturbations of a class of non-convex Hamiltonian functions

Livia Corsi, Roberto Feola, Guido Gentile

摘要:

考虑一类准可积哈密顿系统,该系统是通过向可积系统的非凸哈灵顿函数添加仅取决于角度变量的扰动而获得的。我们专注于一个共振的极大环面的未扰动系统,叶成一个家庭的低维环面余维1,不变的准周期流的旋转向量满足一些温和的丢番图条件。我们表明,至少有一个低维环面的旋转矢量总是存在的扰动系统。证明是基于发散级数的多尺度分析和重算程序。一个关键的作用是发挥适当的对称性和取消,最终由于系统的哈密顿结构。

英文摘要:

We consider a class of quasi-integrable Hamiltonian systems obtained by adding to a non-convex Hamiltonian function of an integrable system a perturbation depending only on the angle variables. We focus on a resonant maximal torus of the unperturbed system, foliated into a family of lower-dimensional tori of codimension 1, invariant under a quasi-periodic flow with rotation vector satisfying some mild Diophantine condition. We show that at least one lower-dimensional torus with that rotation vector always exists also for the perturbed system. The proof is based on multiscale analysis and resummation procedures of divergent series. A crucial role is played by suitable symmetries and cancellations, ultimately due to the Hamiltonian structure of the system.

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