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arXiv 0908.0555math.AGmath.GRmath.GT
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具有水平结构的曲线模空间的Picard群

The Picard group of the moduli space of curves with level structures

Andrew Putman

摘要:

对于$4 \nmid L$和$g$大,我们计算了曲线模空间和具有水平$L$结构的主极化阿贝尔簇的积分Picard群.特别地,我们确定了这些模空间上的标准线丛的整除性质,并计算了映射类群的水平$L$子群的第二整上同调群(在以前的论文中,作者合理地确定了这一点)。这需要计算阿贝尔化的水平$L$子群的映射类群,推广以前的结果Perron,佐藤,和作者。最后,我们计算了系数在伴随表示中的模$L$辛群的第一同调群。

英文摘要:

For $4 \nmid L$ and $g$ large, we calculate the integral Picard groups of the moduli spaces of curves and principally polarized abelian varieties with level $L$ structures. In particular, we determine the divisibility properties of the standard line bundles over these moduli spaces and we calculate the second integral cohomology group of the level $L$ subgroup of the mapping class group (in a previous paper, the author determined this rationally). This entails calculating the abelianization of the level $L$ subgroup of the mapping class group, generalizing previous results of Perron, Sato, and the author. Finally, along the way we calculate the first homology group of the mod $L$ symplectic group with coefficients in the adjoint representation.

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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