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arXiv 0906.1891math-phmath.MP
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连续和离散Hamilton方程的不变性和首次积分

Invariance and first integrals of continuous and discrete Hamiltonian equations

Vladimir Dorodnitsyn, Roman Kozlov

摘要:

本文研究了连续正则哈密顿方程和离散正则哈密顿方程的对称性与第一积分之间的关系。我们观察到,正则哈密顿方程可以得到变分原理从一个作用泛函和考虑不变性的性质,因为它是在拉格朗日形式主义。我们改写了著名的诺特恒等式的哈密顿函数和对称算子。这种方法基于哈密顿作用量的对称性,提供了一种简单明了的方法来构造哈密顿方程的首次积分而无需积分。一个离散的模拟这个身份的开发。它导致的对称性和第一积分的离散哈密顿方程,可以用来保存在数值实现的哈密顿方程的结构特性之间的关系。结果示出了一些连续和离散哈密顿方程的例子。

英文摘要:

In this paper we consider the relation between symmetries and first integrals for both continuous canonical Hamiltonian equations and discrete Hamiltonian equations. We observe that canonical Hamiltonian equations can be obtained by variational principle from an action functional and consider invariance properties of this functional as it is done in Lagrangian formalism. We rewrite the well--known Noether's identity in terms of the Hamiltonian function and symmetry operators. This approach, based on symmetries of the Hamiltonian action, provides a simple and clear way to construct first integrals of Hamiltonian equations without integration. A discrete analog of this identity is developed. It leads to a relation between symmetries and first integrals for discrete Hamiltonian equations that can be used to conserve structural properties of Hamiltonian equations in numerical implementation. The results are illustrated by a number of examples for both continuous and discrete Hamiltonian equations.

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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