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arXiv 1907.04852math.NT
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Picard模形式的周期多项式

Period polynomials for Picard modular forms

Sheldon Joyner

摘要:

与模形式相关的周期多项式所满足的关系给出了计算尖点形式空间维数的方法。在说明了这些关系是如何从亏格为0的曲线的模空间$\mathcal{M}_{0,4}$的映射类群$PSL(2, \mathbb{Z})$上的那些关系中产生的之后,作者接着定义了与Picard模形式相关联的周期多项式。然后确定这些Picard周期多项式的关系,并通过在$PU(2,1 ; \mathbb{Z}[ρ])$中嵌入亏格为0的曲线的模空间$\mathcal{M}_{0,5}$的单值表示(其中$ρ$表示单位的第三根),将它们与$\mathcal{M}_{0,5}.$的几何相关联

英文摘要:

The relations satisfied by period polynomials associated to modular forms yield a way to count dimensions of spaces of cusp forms. After showing how these relations arise from those on the mapping class group $PSL(2, \mathbb{Z})$ of the moduli space $\mathcal{M}_{0,4}$ of genus 0 curves with 4 marked points, the author goes on to define period polynomials associated to Picard modular forms. Relations on these Picard period polynomials are then determined, and via an embedding of a monodromy representation of the moduli space $\mathcal{M}_{0,5}$ of genus 0 curves with 5 marked points in $PU(2,1 ; \mathbb{Z}[ρ])$ (where $ρ$ denotes a third root of unity), they are related to the geometry of $\mathcal{M}_{0,5}.$

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