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arXiv 2101.01432math.DSmath-phmath.MP
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李代数上的Hamilton扰动理论。非自治对称陀螺的应用

Hamiltonian Perturbation Theory on a Lie Algebra. Application to a non-autonomous Symmetric Top

Lorenzo Valvo, Michel Vittot

摘要:

本文提出了一种求解李代数$\mathbb{V}$上Hamilton系统的扰动算法,使之能应用于非正则哈密顿系统.给定一个保持$\mathbb{V}$的子代数$\mathbb{B}$的哈密顿系统,当我们添加一个扰动时,子代数$\mathbb{B}$将不再保持。我们展示了如何将扰动动力系统保持$\mathbb{B}$二次项的扰动。本文应用这种方法研究了非自治对称刚体的动力学问题。在这个例子中,我们的代数变换在KAM类语句的证明中扮演了迭代引理的角色。

英文摘要:

We propose a perturbation algorithm for Hamiltonian systems on a Lie algebra $\mathbb{V}$, so that it can be applied to non-canonical Hamiltonian systems. Given a Hamiltonian system that preserves a subalgebra $\mathbb{B}$ of $\mathbb{V}$, when we add a perturbation the subalgebra $\mathbb{B}$ will no longer be preserved. We show how to transform the perturbed dynamical system to preserve $\mathbb{B}$ up to terms quadratic in the perturbation. We apply this method to study the dynamics of a non-autonomous symmetric Rigid Body. In this example our algebraic transform plays the role of Iterative Lemma in the proof of a KAM-like statement.

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