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素特征域上半单代数群及其李代数表示中的Verma模

The Verma Modules in Representations of Semisimple Algebraic Groups and Its Lie Algebras

【作者】 李宜阳

【导师】 舒斌;

【作者基本信息】 华东师范大学 , 基础数学, 2008, 博士

【摘要】 在本文中,我们主要研究素特征域k上连通、单连通的半单代数群G及其李代数g=Lie G表示中的Verma模.本文主要研究成果有下面几个方面:1.当Z0(λ)的最高权λ落在基本室C0时,在域的特征p比较大的情况下,我们决定了Z0(λ)的所有极大权向量.它们都是单项式形式.而对于这类“单项式形式的”极大权向量,本文给出了一个充分性的界定.2.我们研究了非限制的广义baby Verma模的不可约性问题.我们知道当p-特征函数χ为零时,一般的广义baby Verma模不是不可约的.但当p-特征函数χ为正则幂零时,广义baby Verma模均是不可约的.当p-特征函数χ具有标准Levi型且当最高权入落在基本室C0时,我们给出了An型李代数表示中的广义baby Verma模Uχ(g)(?)U0(PJ)LJ(λ)不可约的充分条件.在此情况下,我们部分解决了Friedlander-Parshall所提出的相关问题.3.我们研究了李代数表示理论中的支柱簇和秩簇理论,当p-特征函数χ是秩1时,我们证明了约化包络代数Uχ(g)与限制包络代数U0(g)(作为左正则模)是(?)g(χ)-等变同构的,从而获得了非限制baby Verma模Zχ(λ)和限制baby Verma模Z0(λ)的秩簇之间的关系式:其中(?)g(χ)={X∈g|χ([X,g])=0}.

【Abstract】 Let G denote a connected, simply connected and semi-simple algebraic group over an algebraically closed field k of characteristic p > 0, and g = LieG be its Lie algebra. In this paper, we mainly study the Verma modules in representations of G and g. In this dissertation, The main results are listed below:1. When the highest weightλof Z0(λ) lie in the fundamental alcove C0, we can determine all the maximal weight vector of Z0(λ) and they are monomials provided that p is bigger than a certain number. For general description of such maximal weight vectors, we give a sufficient condition to judge if a maximal weight vector of a Verma module in the Dist(G)-module category becomes a maximal vector of a baby Verma module in the U0(g)-module category.2. We study irreducible non-restricted generalized baby Verma modules. We know that when p-characterχis zero, a baby Verma module is mostly reducible. But when p-characterχis not zero, the generalized baby Verma module may be irreducible. When the p-characterχhas standard Levi form and the highest weightλis included in the fundamental alcove C0, we get an sufficient condition on generalized baby Verma module Uχ(g) (?)U0(P J) LJ(λ) is irreducible. We partially answered an question addressed by Friedlander and Parshall in the reference [22, 5.1].3. We study support varieties and rank varieties for g. When the rank of p-characterχis 1,we prov the reduced enveloping algebra Uχ(g) and restricted enveloping algebra U0(g) are (?)g(χ)-equivariant isomorphism as left regular modules, so we get the relation between the rank variety of baby Verma module Z0(λ) and the rank variety of baby Verma module Zχ(λ):where (?)g(χ) = {X∈g |χ([X,g]) = 0}.

  • 【分类号】O152.5
  • 【下载频次】74
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