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arXiv 2501.12552math.DG
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关于平移曲面上某些类型圆堆积的唯一性

On the Uniqueness of Certain Types of Circle Packings on Translation Surfaces

Nilay Mishra

AI总结:

本文证明在 $H(1,1)$ 平移曲面上,固定割缝两圆盘时,某些圆堆积在不改变接触图的前提下仅有有限种变化,并利用分裂双角刻画这些变化,进而推广到任意亏格 $g \geq 2$ 的特定曲面。

摘要:

考虑复平面 $\mathbb C$ 中有限多个多边形的集合,使得每个多边形的每条边,在集合中(可能相同)存在另一条边与之平行且长度相等。平移曲面是通过将这些对边相互等同而得到的曲面。$H(1, 1)$ 层由亏格为二且具有两个一阶奇点的平移曲面组成。对应于图 $G$ 的圆堆积是若干不相交圆盘的配置,使得 $G$ 的每个顶点对应一个圆,两个圆盘相切当且仅当它们在 $G$ 中由一条边相连,且 $G$ 是曲面的三角剖分。我们证明了,对于 $H(1, 1)$ 平移曲面上的某些圆堆积,如果沿割缝的两个圆盘被固定,则在不改变接触图的情况下,堆积的变化方式仅有有限多种。这些变化可以用一种称为分裂双角的新概念明确刻画。最后,唯一性定理被推广到任意亏格 $g \geq 2$ 的特定类型平移曲面。

英文摘要:

Consider a collection of finitely many polygons in $\mathbb C$, such that for each side of each polygon, there exists another side of some polygon in the collection (possibly the same) that is parallel and of equal length. A translation surface is the surface formed by identifying these opposite sides with one another. The $H(1, 1)$ stratum consists of genus two translation surfaces with two singularities of order one. A circle packing corresponding to a graph $G$ is a configuration of disjoint disks such that each vertex of $G$ corresponds to a circle, two disks are externally tangent if and only if their vertices are connected by an edge in $G$, and $G$ is a triangulation of the surface. It is proven that for certain circle packings on $H(1, 1)$ translation surfaces, there are only a finite number of ways the packing can vary without changing the contacts graph, if two disks along the slit are fixed in place. These variations can be explicitly characterized using a new concept known as splitting bigons. Finally, the uniqueness theorem is generalized to a specific type of translation surfaces with arbitrary genus $g \geq 2$.

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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