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arXiv 0905.3002math.GTmath.AG
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曲面同调上的伽罗瓦群表示

Representations of Galois Groups on the Homology of Surfaces

Thomas Koberda, Aaron Michael Silberstein

摘要:

设$p:Σ'\toΣ$是一个有限的伽罗瓦覆盖,可能有分支,伽罗瓦群为$G$ .我们感兴趣的是$Σ'$作为$G$上的模的上同调的结构。我们分别处理有分支覆盖和无分支覆盖的情况。在分支覆盖的情况下,我们给出了$H_1(Σ',\bC)$可能的模结构的完整分类。在无分支的情况下,我们代数几何地实现了在$Σ'$上的全纯1-形式上的$G$的表示作为在$G$ -torson的并集上的函数。我们还明确实现了这些表示的某些分支覆盖的超椭圆曲线。给出了它在曲面的伪Anosov同胚和映射类群的表示论研究中的一些应用。

英文摘要:

Let $p:Σ'\toΣ$ be a finite Galois cover, possibly branched, with Galois group $G$. We are interested in the structure of the cohomology of $Σ'$ as a module over $G$. We treat the cases of branched and unbranched covers separately. In the case of branched covers, we give a complete classification of possible module structures of $H_1(Σ',\bC)$. In the unbranched case, we algebro-geometrically realize the representation of $G$ on holomorphic 1-forms on $Σ'$ as functions on unions of $G$-torsors. We also explicitly realize these representations for certain branched covers of hyperelliptic curves. We give some applications to the study of pseudo-Anosov homeomorphisms of surfaces and representation theory of the mapping class group.

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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