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arXiv 1107.3547math.GTmath.GR
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同调曲线复形的几何

Geometry of the Homology Curve Complex

Ingrid Irmer

摘要:

设$S$是亏格至少为2的有向闭曲面。本文研究了$S$的同调多曲复形$\mathcal{HC}(S,α)$的几何性质;该复形与Bestvina-Bux-Margalit和Hatcher研究的复形密切相关。$\mathcal{HC}(S,α)$中的路径对应于$S\times I$中浸入曲面的同伦类。这个观察是用来设计一个简单的算法,用于构建连接任何两个顶点的准测地线在$\mathcal{HC}(S,α)$,并在$S\times I$构建最小亏格曲面。证明了对于$g \geq 3$,$\mathcal{HC}(S, α)$中两个顶点之间的距离的最佳可能界线性地依赖于它们的相交数,与曲线的复数中得到的对数界相反。对于$g \geq 4$,证明了$\mathcal{HC}(S, α)$不是$δ$ -双曲线.

英文摘要:

Suppose $S$ is a closed, oriented surface of genus at least two. This paper investigates the geometry of the homology multicurve complex, $\mathcal{HC}(S,α)$, of $S$; a complex closely related to complexes studied by Bestvina-Bux-Margalit and Hatcher. A path in $\mathcal{HC}(S,α)$ corresponds to a homotopy class of immersed surfaces in $S\times I$. This observation is used to devise a simple algorithm for constructing quasi-geodesics connecting any two vertices in $\mathcal{HC}(S,α)$, and for constructing minimal genus surfaces in $S\times I$. It is proven that for $g \geq 3$ the best possible bound on the distance between two vertices in $\mathcal{HC}(S, α)$ depends linearly on their intersection number, in contrast to the logarithmic bound obtained in the complex of curves. For $g \geq 4$ it is shown that $\mathcal{HC}(S, α)$ is not $δ$-hyperbolic.

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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