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arXiv 1102.0663nlin.SI
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离散时间Calogero-Moser系统与Lagrangian 1-form结构

Discrete-time Calogero-Moser system and Lagrangian 1-form structure

Sikarin Yoo-kong, Sarah Lobb, Frank Nijhoff

摘要:

我们研究了(理性)Calogero-Moser(CM)系统的Lagrange形式主义,无论是在离散时间还是在连续时间,作为最近论文[19]意义上的Lagrange 1-形式结构的第一个例子。CM系统的离散时间模型是在一段时间前建立的,它是KP方程的半离散版本的极点减少,并被证明导致一个完全可积的对应关系(多值映射)。在本文中,我们提出了完整的KP解决方案的基础上的离散时间流在两个离散KP变量的交换性。相应的Lax矩阵的兼容性直接导致相关的拉格朗日封闭关系的水平。在KP方程和CM系统的水平上进行连续的连续极限,我们为CM模型的连续情形建立了适当的Lagrange 1-形式结构。我们使用三粒子情形的例子来阐明[19]中提出的新颖的最小作用量原理在拉格朗日1-形式的更简单情形中的实现。

英文摘要:

We study the Lagrange formalism of the (rational) Calogero-Moser (CM) system, both in discrete time as well as in continuous time, as a first example of a Lagrange 1-form structure in the sense of the recent paper [19]. The discrete-time model of the CM system was established some time ago arising as a pole-reduction of a semi-discrete version of the KP equation, and was shown to lead to an exactly integrable correspondence (multivalued map). In this paper we present the full KP solution based on the commutativity of the discrete-time flows in the two discrete KP variables. The compatibility of the corresponding Lax matrices is shown to lead directly to the relevant closure relation on the level of the Lagrangians. Performing successive continuum limits on both the level of the KP equation as well as of the CM system, we establish the proper Lagrange 1-form structure for the continuum case of the CM model. We use the example of the three-particle case to elucidate the implementation of the novel least-action principle, which was presented in [19], for the simpler case of Lagrange 1-forms.

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