arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1005.0422math.GR
收藏

关于交换环上Chevalley群的线性表示

On linear representations of Chevalley groups over commutative rings

Igor A. Rapinchuk

摘要:

设$G$是对应于秩为$\geq 2$的既约不可约根系的泛Chevalley-Demazure群概型,$R$是交换环.本文分析了初等子群$G(R)^+ \subset G(R).$的代数闭域$K$上的线性表示$ρ\colon G(R)^+ \to GL_n (K)$,主要结果是在一定条件下,任何这样的表示都有一个标准的描述,即存在一个交换的有限维$K$ -代数$B$,一个具有Zerkiki-稠密象的环同态$f \colon R \to B$,以及代数群$σ\colon G(B) \to GL_n (K)$的态射,使得$ρ$与$σ\circ F$在合适的有限指数子群$Γ\subset G(R)^+,$上重合,其中$F \colon G(R)^+ \to G(B)^+$是由$f.$诱导的群同态特别地,这证实了Borel和Tits关于特征为零的域上Chevalley群的猜想。

英文摘要:

Let $G$ be the universal Chevalley-Demazure group scheme corresponding to a reduced irreducible root system of rank $\geq 2$, and let $R$ be a commutative ring. We analyze the linear representations $ρ\colon G(R)^+ \to GL_n (K)$ over an algebraically closed field $K$ of the elementary subgroup $G(R)^+ \subset G(R).$ Our main result is that under certain conditions, any such representation has a standard description, i.e. there exists a commutative finite-dimensional $K$-algebra $B$, a ring homomorphism $f \colon R \to B$ with Zariski-dense image, and a morphism of algebraic groups $σ\colon G(B) \to GL_n (K)$ such that $ρ$ coincides with $σ\circ F$ on a suitable finite index subgroup $Γ\subset G(R)^+,$ where $F \colon G(R)^+ \to G(B)^+$ is the group homomorphism induced by $f.$ In particular, this confirms a conjecture of Borel and Tits for Chevalley groups over a field of characteristic zero.

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。

↑