论文标题

在组合Teichmüller空间的Kontsevich几何形状上

On the Kontsevich geometry of the combinatorial Teichmüller space

论文作者

Andersen, Jørgen Ellegaard, Borot, Gaëtan, Charbonnier, Séverin, Giacchetto, Alessandro, Lewański, Danilo, Wheeler, Campbell

论文摘要

对于边界表面s,我们在组合Teichmüller空间的几何形状$ t_s^{comb} $之间建立了一个完全相似之处,配备了Kontsevich Symplectic form $ω_k$,然后是通常的Weil-PeterssondeichmüllerSpace $ t_s $ t_s $。这样做的基础是$ t_s^{comb} $的识别,并具有带有横向边界条件的测量叶子空间。我们为$ t_s^{comb} $配备了Fenchel-Nielsen坐标的类似物(定义与Dehn-Thurston坐标类似),并表明它们是Darboux的darboux,以$ω_k$(wolpert for wolpert formula的类似物)。然后,我们在Andersen-Borot-Ortin的几何递归中建立了映射类别组不变的功能,它们在$ t_s^{comb} $上,其集成与Kontsevich体积形式的集成满足拓扑结合。此外,我们建立了mirzakhani-mcshane身份的类似物,并为相对于组合长度和Masur-deech量的多型枚举提供了应用。形式主义使我们能够提供Witten的猜想/Kontsevich定理和Norbury在组合模量空间中的晶格计数的均匀的几何证明,这与Mirzakhani对Weil-Petersson的回收证明了。 We strengthen results of Mondello and Do on the convergence of hyperbolic geometry to combinatorial geometry along the rescaling flow, allowing us to flow systematically natural constructions on the usual Teichmüller space to their combinatorial analogue, such as a new derivation of the piecewise linear structure of $T_S^{comb}$ originally obtained in the work of Penner, as the limit under the flow of the smooth structure of $ T_S $。

For bordered surfaces S, we develop a complete parallel between the geometry of the combinatorial Teichmüller space $T_S^{comb}$ equipped with Kontsevich symplectic form $ω_K$, and then the usual Weil-Petersson geometry of Teichmüller space $T_S$. The basis for this is an identification of $T_S^{comb}$ with a space of measured foliations with transverse boundary conditions. We equip $T_S^{comb}$ with an analog of the Fenchel-Nielsen coordinates (defined similarly as Dehn-Thurston coordinates) and show they are Darboux for $ω_K$ (analog of Wolpert formula). We then set up the geometric recursion of Andersen-Borot-Orantin to produce mapping class group invariants functions on $T_S^{comb}$ whose integration with respect to Kontsevich volume form satisfy topological recursion. Further we establish an analog of Mirzakhani-McShane identities, and provide applications to the study of the enumeration of multicurves with respect to combinatorial lengths and Masur-Veech volumes. The formalism allows us to provide uniform and completely geometric proofs of Witten's conjecture/Kontsevich theorem and Norbury's topological recursion for lattice point count in the combinatorial moduli space, parallel to Mirzakhani's proof of her recursion for Weil-Petersson volumes. We strengthen results of Mondello and Do on the convergence of hyperbolic geometry to combinatorial geometry along the rescaling flow, allowing us to flow systematically natural constructions on the usual Teichmüller space to their combinatorial analogue, such as a new derivation of the piecewise linear structure of $T_S^{comb}$ originally obtained in the work of Penner, as the limit under the flow of the smooth structure of $T_S$.

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