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arXiv 1409.3553hep-thmath-phmath.COmath.MP
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超几何Hurwitz数的矩阵模型

The matrix model for hypergeometric Hurwitz numbers

Jan Ambjorn, Leonid Chekhov

摘要:

本文给出了复射影线在$n$不动点$z_i$,$i=1,\dots,n$(广义Grotendieck's dessins d 'enfants)上分支覆盖的生成函数的多矩阵模型,这些不动点具有固定的亏格、度和在两点的分支轮廓$z_1$和$z_n$ .我们对其他$n-2$点上的所有可能分支求和,其中在$z_2$处的轮廓长度固定,并且在其余$n-3$点处的轮廓总长度固定。所有这些模型都属于一类超几何Hurwitz模型,因此被tau函数的Kadomtsev-Petviashvili(KP)层次。在上述情况下,我们可以将获得的模型表示为具有$\tr M_iM_{i+1}^{-1}$类型的(非标准)最近邻相互作用的矩阵链。我们描述了这种模型的光谱曲线的评价技术,它打开了可能性,应用拓扑递归开发$1/N^2$ -这些模型的扩展。这些光谱曲线原来是一个代数型。

英文摘要:

We present the multi-matrix models that are the generating functions for branched covers of the complex projective line ramified over $n$ fixed points $z_i$, $i=1,\dots,n$, (generalized Grotendieck's dessins d'enfants) of fixed genus, degree, and the ramification profiles at two points, $z_1$ and $z_n$. We take a sum over all possible ramifications at other $n-2$ points with the fixed length of the profile at $z_2$ and with the fixed total length of profiles at the remaining $n-3$ points. All these models belong to a class of hypergeometric Hurwitz models thus being tau functions of the Kadomtsev--Petviashvili (KP) hierarchy. In the case described above, we can present the obtained model as a chain of matrices with a (nonstandard) nearest-neighbor interaction of the type $\tr M_iM_{i+1}^{-1}$. We describe the technique for evaluating spectral curves of such models, which opens the possibility of applying the topological recursion for developing $1/N^2$-expansions of these model. These spectral curves turn out to be of an algebraic type.

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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