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arXiv 1701.03225math.AGmath.NTmath.RT
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正交模簇的Kodaira维数

On the Kodaira dimension of orthogonal modular varieties

Shouhei Ma

摘要:

我们证明了在标度上,只有n ≥ 20或n=17的符号为(2,n)的整数格L有2/3个,使得由L的正交群定义的模簇不是一般型的.特别地,当n>107时,由签名(2,n)的有理二次型的算术群定义的每个模簇是一般型的。对于稳定的正交群,我们也得到了n>8时类似的有限性.作为副产品,我们得到了有限格允许反射模形式有界消失阶,这证明了一个猜想的Gritsenko和Nikulin。

英文摘要:

We prove that up to scaling there are only finitely many integral lattices L of signature (2,n) with n>20 or n=17 such that the modular variety defined by the orthogonal group of L is not of general type. In particular, when n>107, every modular variety defined by an arithmetic group for a rational quadratic form of signature (2,n) is of general type. We also obtain similar finiteness in n>8 for the stable orthogonal groups. As a byproduct we derive finiteness of lattices admitting reflective modular form of bounded vanishing order, which proves a conjecture of Gritsenko and Nikulin.

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