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The kernel of the monodromy of the universal family of degree d smooth plane curves
Journal of Topology and Analysis ( IF 0.5 ) Pub Date : 2020-01-15 , DOI: 10.1142/s1793525320500375
Reid Monroe Harris 1
Affiliation  

We consider the parameter space 𝒰d of smooth plane curves of degree d. The universal smooth plane curve of degree d is a fiber bundle d 𝒰d with fiber diffeomorphic to a surface Σg. This bundle gives rise to a monodromy homomorphism ρd : π1(𝒰d) Mod(Σg), where Mod(Σg) := π0(Diff+(Σ g)) is the mapping class group of Σg. The main result of this paper is that the kernel of ρ4 : π1(𝒰4) Mod(Σ3) is isomorphic to F× /3, where F is a free group of countably infinite rank. In the process of proving this theorem, we show that the complement Teich(Σg)g of the hyperelliptic locus g in Teichmüller space Teich(Σg) has the homotopy type of an infinite wedge of spheres. As a corollary, we obtain that the moduli space of plane quartic curves is aspherical. The proofs use results from the Weil–Petersson geometry of Teichmüller space together with results from algebraic geometry.

中文翻译:

d 次平滑平面曲线全族单调的核

我们考虑参数空间𝒰d度数的平滑平面曲线d. 度数的通用平滑平面曲线d是一个纤维束d 𝒰d具有与表面微分同胚的纤维ΣG. 这个丛产生单调同态ρd π1(𝒰d) 模组(ΣG), 在哪里模组(ΣG) = π0(差异+(Σ G))是的映射类组ΣG. 本文的主要结果是内核ρ4 π1(𝒰4) 模组(Σ3)同构于F× /3, 在哪里F是一个可数无限秩的自由群。在证明这个定理的过程中,我们证明了补泰克(ΣG)G超椭圆轨迹的G在泰克米勒空间泰克(ΣG)具有无限楔形球体的同伦类型。作为推论,我们得到平面四次曲线的模空间是非球面的。证明使用了 Teichmüller 空间的 Weil-Petersson 几何的结果以及代数几何的结果。
更新日期:2020-01-15
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