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arXiv 1306.0962math-phmath.MPnlin.SI
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有限域上离散可积方程的研究

Studies on the discrete integrable equations over finite fields

Masataka Kanki

摘要:

研究了有限域上的离散动力系统,讨论了它们的可积性。特别地,在有限域上定义了离散的潘勒韦方程和离散的KdV方程,并得到了它们的特解.他们对有限域的研究还没有彻底完成,部分原因是在定义方程时出现了不确定性。本文介绍了有限域上方程的两种定义方法,并将这两种方法应用于几类离散可积方程。一种方法是通过在奇点处爆破来扩展初始条件空间。在离散潘勒韦方程的情况下,我们证明了Sakai理论的有限域模拟可以用来构造初始条件空间。另一种方法是将方程定义在$p$ -adic数域上,然后将其约化为有限域。其时间演化与约简可交换的映射被称为具有“好约简”。为了应用于可积映射,我们推广了好的约化。广义好约简被公式化为“几乎好约简”,并被证明是奇异约束检验的$p$ -adic模拟。(* 请注意,本文是作者的论文,它来自我们已经发表的几篇论文。也请注意,一些小的修改已经从原来的论文。)

英文摘要:

Discrete dynamical systems over finite fields are investigated and their integrability is discussed. In particular, the discrete Painlevé equations and the discrete KdV equation are defined over finite fields and their special solutions are obtained. Their investigation over the finite fields has not been done thoroughly, partly because of the indeterminacies that appear in defining the equations. In this paper we introduce two methods to well-define the equations over the finite fields and apply the methods to several classes of discrete integrable equations. One method is to extend the space of initial conditions through blowing-up at the singular points. In case of discrete Painlevé equations, we prove that an finite field analog of the Sakai theory can be applied to construct the space of initial conditions. The other method is to define the equations over the field of $p$-adic numbers and then reduce them to the finite fields. The mapping whose time evolutions commute with the reduction is said to have a `good reduction'. We generalize good reduction in order to be applied to integrable mappings. The generalized good reduction is formulated as `almost good reduction' and is proved to be a $p$-adic analog of the singularity confinement test. (*Note that this paper is intended for the author's thesis and it draws from several of our already published papers. Also note that several minor modifications have been made from the original thesis.)

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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