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arXiv 2008.08392math.NTmath.AG
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作为正交模簇的射影空间

Projective spaces as orthogonal modular varieties

Haowu Wang, Brandon Williams

摘要:

我们构造了作用在Cartan IV型对称域$\mathcal{D}$上的$16$反射群$Γ$,其中模形式的分次代数由相同权的形式自由生成,特别是$\mathcal{D} / Γ$的Satake-Bethal-Borel紧化同构于一个射影空间.其中四个是Freitag以前已知的结果-Salvati Manni,Matsumoto,Perna和Runge。此外,我们还发现了几个新的正交型模群,它们的模形式代数是自由生成的。

英文摘要:

We construct $16$ reflection groups $Γ$ acting on symmetric domains $\mathcal{D}$ of Cartan type IV, for which the graded algebras of modular forms are freely generated by forms of the same weight, and in particular the Satake--Baily--Borel compactification of $\mathcal{D} / Γ$ is isomorphic to a projective space. Four of these are previously known results of Freitag--Salvati Manni, Matsumoto, Perna and Runge. In addition we find several new modular groups of orthogonal type whose algebras of modular forms are freely generated.

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