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arXiv 1105.0987math.GT
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论整环复形的粗几何

On the coarse geometry of the complex of domains

Valentina Disarlo

摘要:

区域复形$D(S)$是一个具有非常丰富的单纯形结构的几何工具,它包含曲线复形$C(S)$作为单纯子复形。在本文中,我们将把它作为一个度量空间,赋予度量,使每个单形的欧氏长度为1的边缘,我们将讨论其粗糙的几何。证明了对于$D(S)$的每个包含曲线复形$C(S)$的子复形$Δ(S)$,自然单纯包含$C(S) \to Δ(S)$是等距嵌入和拟等距嵌入.证明了弧复形$A(S)$与$D(S)$的子复形$P_\partial(S)$是拟等距的,并且证明了单纯包含$P_\partial(S) \to D(S)$是拟等距嵌入的充要条件是$S$的亏格为0.然后,我们将这些结果应用于圆弧和曲线复合体$AC(S)$。给出了$AC(S)$与$C(S)$拟等距的一个新的证明,并讨论了单纯包含$A(S) \to AC(S)$的度量性质.

英文摘要:

The complex of domains $D(S)$ is a geometric tool with a very rich simplicial structure, it contains the curve complex $C(S)$ as a simplicial subcomplex. In this paper we shall regard it as a metric space, endowed with the metric which makes each simplex Euclidean with edges of length 1, and we shall discuss its coarse geometry. We prove that for every subcomplex $Δ(S)$ of $D(S)$ which contains the curve complex $C(S)$, the natural simplicial inclusion $C(S) \to Δ(S)$ is an isometric embedding and a quasi-isometry. We prove that, except a few cases, the arc complex $A(S)$ is quasi-isometric to the subcomplex $P_\partial(S)$ of $D(S)$ spanned by the vertices which are peripheral pair of pants, and we prove that the simplicial inclusion $P_\partial(S) \to D(S)$ is a quasi-isometric embedding if and only if $S$ has genus 0. We then apply these results to the arc and curve complex $AC(S)$. We give a new proof of the fact that $AC(S)$ is quasi-isometric to $C(S)$, and we discuss the metric properties of the simplicial inclusion $A(S) \to AC(S)$.

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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