arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2211.03429math.GTmath.GR
收藏

Thurston 骨架的等变形变收缩

An equivariant deformation retraction of the Thurston spine

Ingrid Irmer

AI总结:

本文证明了闭可定向曲面 Teichmüller 空间存在映射类群等变的形变收缩到 Thurston 骨架,其维数等于映射类群的虚上同调维数。

摘要:

本文证明了对于闭可定向曲面的 Teichmüller 空间,存在一个映射类群等变的形变收缩,将其收缩到一个维数等于映射类群虚上同调维数的胞腔复形上。该形变收缩的像包含在 Thurston 首次描述的 CW 复形中,即 Thurston 骨架。Thurston 骨架是 Teichmüller 空间中对应于双曲曲面的点的集合,这些双曲曲面的最短测地线(即 systoles)将曲面切割成多边形。

英文摘要:

This paper shows that there is a mapping class group-equivariant deformation retraction of the Teichmüller space of a closed, orientable surface onto a cell complex of dimension equal to the virtual cohomological dimension of the mapping class group. The image of the deformation retraction is contained in the CW complex first described by Thurston -- the Thurston spine. The Thurston spine is the set of points in Teichmüller space corresponding to hyperbolic surfaces for which the set of shortest geodesics (the systoles) cuts the surface into polygons.

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。

↑