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arXiv 1703.03343math.CV
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稳定的$(γ,n)$ -双Riemann surfaces的均匀化

Uniformizations of stable $(γ,n)$-gonal Riemann surfaces

Ruben A. Hidalgo

摘要:

一个$(γ,n)$对是一个对$(S,f)$,其中$S$是一个闭黎曼曲面,而$f:S \to R$是到一个亏格为$γ$的闭黎曼曲面$R$上的一个度$n$全纯映射.如果$(S,f)$的签名是双曲线型的,则存在对$(Γ,G)$,称为$(S,f)$的一致化,其中$G$是作用于单位圆盘${\mathbb D}$的Fuchsian群,该单位圆盘包含$Γ$作为索引$n$子群,使得$f$通过包含$Γ<G$而导出。的统一化是唯一确定的$(S,f)$,直到共轭的全纯自同构的${\mathbb D}$,它允许提供自然复杂的orbifold结构的赫维茨空间参数化(扭曲)同构类的对拓扑等价于$(S,f)$。为了产生这些Hurwitz空间的某些紧化,需要考虑所谓的稳定的$(γ,n)$ -P-S对,它们是$(γ,n)$ -P-S对的自然几何变形。由于以上所述,寻找稳定的$(γ,n)$ -对偶对在某类Kleinian群中的一致化似乎是有趣的。在本文中,我们审查这样的一致化通过使用节点Fuchsian群,这是(几何)限制Fuchsian群的拟共形变形,并提供稳定的黎曼orbifolds的一致化。这些单值化允许获得具有复杂orbifold结构的Hurwitz空间的紧化,这些是$G$的增广Teichmüller空间通过其模群的适当有限指数子群的继承。

英文摘要:

A $(γ,n)$-gonal pair is a pair $(S,f)$, where $S$ is a closed Riemann surface and $f:S \to R$ is a degree $n$ holomorphic map onto a closed Riemann surface $R$ of genus $γ$. If the signature of $(S,f)$ is of hyperbolic type, then there is pair $(Γ,G)$, called an uniformization of $(S,f)$, where $G$ is a Fuchsian group acting on the unit disc ${\mathbb D}$ containing $Γ$ as an index $n$ subgroup, so that $f$ is induced by the inclusion of $Γ<G$. The uniformization is uniquely determined by $(S,f)$, up to conjugation by holomorphic automorphisms of ${\mathbb D}$, and it permits to provide natural complex orbifold structures on the Hurwitz spaces parametrizing (twisted) isomorphic classes of pairs topologically equivalent to $(S,f)$. In order to produce certain compactifications of these Hurwitz spaces, one needs to consider the so called stable $(γ,n)$-gonal pairs, which are natural geometrical deformations of $(γ,n)$-gonal pairs. Due to the above, it seems interesting to search for uniformizations of stable $(γ,n)$-gonal pairs, in terms of certain class of Kleinian groups. In this paper we review such uniformizations by using noded Fuchsian groups, which are (geometric) limits of quasiconformal deformations of Fuchsian groups, and which provide uniformizations of stable Riemann orbifolds. These uniformizations permit to obtain a compactification of the Hurwitz spaces with a complex orbifold structure, these being quotients of the augmented Teichmüller space of $G$ by a suitable finite index subgroup of its modular group.

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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