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arXiv 0903.3291math.AGmath.RT
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关于喷丛和广义韦尔马模II

On jet bundles and generalized Verma modules II

Helge Øystein Maakestad

摘要:

设G是特征为零的域上的半单线性代数群,V是具有最高权向量v的有限维不可约G-模,P是G中不动点v的抛物子群,g=Lie(G).我们得到了V通过P-模U^k(g)v的一个正则滤子,其中U^k(g)是泛包络代数U(g)的滤子.这种过滤是在以前的文件中研究的情况下,P在G=SL(E)是固定的m维子空间的子群。本文的目的是利用G-线性化层的高次直象、广义韦尔马模的滤子和最高权向量的零化子理想给出SL(E)中的P是在E中固定一个标志的抛物群时U^k(g)的一个基并计算它的维数。我们还用SL(E)/P上的SL(E)线性化喷流丛解释了过滤U^k(g)。

英文摘要:

Let G be a semi simple linear algebraic group over a field of characteristic zero and let V be a finite dimensional irreducible G-module with highest weight vector v. Let P in G be the parabolic subgroup fixing v and let g=Lie(G). We get a canonical filtration of V by P-modules U^k(g)v where U^k(g) is the filtration of the universal enveloping algebra U(g). This filtration was in a previous paper studied in the case where P in G=SL(E) is the subgroup fixing an m-dimensional subspace. The aim of this paper is to use higher direct images of G-linearized sheaves, filtrations of generalized Verma modules and annihilator ideals of highest weight vectors to give a basis for U^k(g) and to compute its dimension in the case where P in SL(E) is the parabolic group fixing a flag in E. We also interpret the filtration U^k(g) in terms of SL(E)-linearized jet bundles on SL(E)/P.

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