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arXiv 2101.01424math.NT
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正特征的一般射影线性群的Bruhat-Tits作图的算术公式

Arithmetic quotients of the Bruhat-Tits building for projective general linear group in positive characteristic

Satoshi Kondo, Seidai Yasuda

摘要:

令$d \ge 1$。本文研究了正特征整体域(或有限域上曲线的函数域)上$\mathrm{GL}_d$的自守形式空间的子空间。我们固定$F$的一个位置$\infty$,并且我们考虑由自守形式组成的子空间$\mathcal{A}_{\mathrm{St}}$,使得相关的自守表示的$\infty$处的局部分量是Steinberg表示(在文中要精确)。我们有两个结果。一个定理(定理16)将$\mathcal{A}_{\mathrm{St}}$的组成部分描述为自守表示,并给出了一个重数为1的类型语句。对于另一个定理(定理12),我们利用Bruhat-Tits建筑的几何构造了一个模符号在$\mathcal{A}_{\mathrm{St}}$中的模拟(即在$\mathbb{Z}$值自守形式的空间中)。我们证明了商是有限的,并给出了这个商的指数上界。

英文摘要:

Let $d \ge 1$. We study a subspace of the space of automorphic forms of $\mathrm{GL}_d$ over a global field of positive characteristic (or, a function field of a curve over a finite field). We fix a place $\infty$ of $F$, and we consider the subspace $\mathcal{A}_{\mathrm{St}}$ consisting of automorphic forms such that the local component at $\infty$ of the associated automorphic representation is the Steinberg representation (to be made precise in the text). We have two results. One theorem (Theorem 16) describes the constituents of $\mathcal{A}_{\mathrm{St}}$ as automorphic representation and gives a multiplicity one type statement. For the other theorem (Theorem 12), we construct, using the geometry of the Bruhat-Tits building, an analogue of modular symbols in $\mathcal{A}_{\mathrm{St}}$ integrally (that is, in the space of $\mathbb{Z}$-valued automorphic forms). We show that the quotient is finite and give a bound on the exponent of this quotient.

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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