Hamiltonian representation of isomonodromic deformations of general rational connections on $\mathfrak{gl}_2(\mathbb{C})$
Université Jean Monnet Saint-Étienne, CNRS, Institut Camille Jordan UMR 5208(圣艾蒂安让·莫内大学,法国国家科学研究中心,卡米尔·乔丹研究所);Institut Universitaire de France(法国高等研究院);Université de Genève, Section de mathématiques(日内瓦大学数学系)
Olivier Marchal, Nicolas Orantin, Mohamad Alameddine
备注:
86 pages + appendices. Published version in NonLinearity
In this paper, we construct the Hamiltonian systems attached to generic $\mathfrak{gl}_2(\mathbb{C})$ meromorphic connections with an arbitrary number of unramified poles of arbitrary orders, under the assumption that every leading polar coefficient is regular semisimple. In particular, we propose the Lax pairs and Hamiltonian evolutions expressed in terms of irregular times and monodromies associated to the poles as well as $g$ pairs of Darboux coordinates defined as the apparent singularities arising in the oper gauge. Moreover, we also provide a reduction of the isomonodromic deformations to a subset of $g$ non-trivial isomonodromic deformations. This reduction is equivalent to a map reducing the set of irregular times to only $g$ non-trivial isomonodromic times. We apply our construction to all genus-one cases covered by these hypotheses and recover the standard Painlevé equations $2$--$6$. We finally make the connection with the topological recursion and the quantization of classical spectral curves from this perspective.
Hamiltonian representation of isomonodromic deformations of twisted rational connections: The Painlevé $1$ hierarchy
Université de Lyon(里昂大学);Université Jean Monnet Saint-Étienne(圣艾蒂安让·莫内大学);CNRS UMR 5208, Institut Camille Jordan(法国国家科学研究中心 5208 联合实验室,卡米尔·若当研究所);Institut Universitaire de France(法兰西学院)
Monodromy dependence and connection formulae for isomonodromic tau functions
本文讨论了有理系数线性常微分方程组的Jimbo-Miwa-Ueno微分1-形式到在扩展单值数据的全空间上封闭的形式的推广。这个推广是在M. Bertola推广了B.玛格兰奇我们展示了如何1-形式可以用来解决一个长期存在的问题,评估的连接公式的isomonodromic tau函数,其中包括一个明确的计算相关的常数因子。我们解释了这个计划是如何工作的Fuchsian系统,特别是,计算连接常数通用Painlevé VI tau函数。结果证明了\cite{ILT13}中提出的该常数的解析式。我们还将该方法应用于非Fuchsian系统,并评估Painlevé II tau函数渐近性中的常数因子。
Dual Isomonodromic Deformations and Moment Maps to Loop Algebras
利用从辛向量空间到两个不同loop代数的对偶空间的参数依赖矩对映射,解释了Jimbo { \it et al }的保单值变形方程的Hamilton结构.产生变形的非自治Hamilton系统通过拉回Poisson子空间上的谱不变量来获得,Poisson子空间由在回路参数中有理的元素组成,并通过确定矩映射来确定变形参数。这种结构导致“双”对矩阵微分算子的monodromy是保存在同一家庭的变形。作为说明性的例子,涉及离散和连续的减少,一个更高的排名推广的哈密顿方程的关联函数的不可穿透的玻色气体,以及对偶对isomonodromy表示的Painleve超越$P_{V}$和$P_{VI}$的方程。
Calogero-Sutherland hyperbolic system and Heckman-Opdam $\mathfrak{gl}_n$ hypergeometric function
Beijing Institute of Mathematical Sciences and Applications(北京国际数学研究中心);Steklov Mathematical Institute(斯捷克洛夫数学研究所);Department of Mathematics, Technion(以色列理工学院数学系);National Research University Higher School of Economics(国立研究高等经济学院);Skolkovo Institute of Science and Technology(斯科尔科沃科学技术研究所)