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arXiv 2005.04616math.DS
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具有光滑不变环面族的Hamilton系统和可逆系统

Hamiltonian and reversible systems with smooth families of invariant tori

Mikhail B. Sevryuk

摘要:

对于各种值的n,d,和相空间维,我们构造简单的例子,哈密顿和可逆系统具有光滑的d-参数家庭不变的n-环面进行有条件的周期运动。在哈密顿的情况下,这些环面可以是各向同性的,共各向同性的,或无向性的(既不是各向同性的,也不是共各向同性的)。考虑了非紧和紧相空间的情形。特别地,对于任何不小于3的N和R^N中的任何向量ω,我们给出了一个具有N个自由度的解析哈密顿系统的例子,该系统具有一个孤立的(甚至是唯一的)不变N环面,该环面携带频率向量为ω的条件周期运动(但该环面是吸阻的而不是拉格朗日的,辛形式是不精确的)。本文首次给出了孤立的具有条件周期运动的迷向不变环面的例子。本文也可以用来作为一个介绍问题的孤立性不变环面的哈密顿和可逆系统。

英文摘要:

For various values of n, d, and the phase space dimension, we construct simple examples of Hamiltonian and reversible systems possessing smooth d-parameter families of invariant n-tori carrying conditionally periodic motions. In the Hamiltonian case, these tori can be isotropic, coisotropic, or atropic (neither isotropic nor coisotropic). The cases of non-compact and compact phase spaces are considered. In particular, for any N no less than 3 and any vector omega in R^N, we present an example of an analytic Hamiltonian system with N degrees of freedom and with an isolated (and even unique) invariant N-torus carrying conditionally periodic motions with frequency vector omega (but this torus is atropic rather than Lagrangian and the symplectic form is not exact). Examples of isolated atropic invariant tori carrying conditionally periodic motions are given in the paper for the first time. The paper can also be used as an introduction to the problem of the isolatedness of invariant tori in Hamiltonian and reversible systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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