有限环上概型的计数点与算术格的计数表示
Counting points of schemes over finite rings and counting representations of arithmetic lattices
摘要：
我们将有限环上$X$的奇点与有限环上$X$的点数的渐近性联系起来。这部分回答了Mustata的问题。我们使用这个结果来计数算术格的表示。更精确地说，如果$Γ$是一个算术格，其$\mathbb{Q}$秩大于1，则令$r_n(Γ)$是$Γ$直到同构的不可约$n$维表示的个数.我们证明了存在一个常数$C$（例如，$C=746$就足够了），使得对于每个这样的$Γ$，都有$r_n(Γ)=O(n^C)$。这回答了Larsen和Lubotzky的一个问题。
英文摘要：
We relate the singularities of a scheme $X$ to the asymptotics of the number of points of $X$ over finite rings. This gives a partial answer to a question of Mustata. We use this result to count representations of arithmetic lattices. More precisely, if $Γ$ is an arithmetic lattice whose $\mathbb{Q}$-rank is greater than one, let $r_n(Γ)$ be the number of irreducible $n$-dimensional representations of $Γ$ up to isomorphism. We prove that there is a constant $C$ (for example, $C=746$ suffices) such that $r_n(Γ)=O(n^C)$ for every such $Γ$. This answers a question of Larsen and Lubotzky.
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