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arXiv 1003.0816math.AGmath.RT
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射影空间II上的喷流丛

Jet bundles on projective space II

Helge Øystein Maakestad

摘要:

设G=SL(E)是E上的特殊线性代数群,其中E是特征为零的域K上的有限维向量空间。本文研究了Grassmannian G/P上G-线性化可逆层L的整体瓣的对偶G-模的正则滤子,其中P是E中稳定子空间W的抛物子群.我们将正则滤子分类为P-模,从而恢复了关于射影空间上喷丛J(L)的P-模结构的已知公式。研究了射影直线上可逆层O(d)的关联复形,证明了它给出了O(d)的关联方案I(O(d))的一个分解.本研究的目的是将其应用于研究的理想层的可逆层的判别式的格拉斯曼和旗品种的解决方案。给出了柯西公式的一个初等证明。因此,本文引入了任意不可约SL(E)-模的典范滤子,并研究了SL(E)中P为抛物子群时,SL(E)-模作为P-模的典范滤子.

英文摘要:

Let G=SL(E) be the special linear algebraic group on E where E is a finite dimensional vector space over a field K of characteristic zero. In this paper we study the canonical filtration of the dual G-module of global sections of a G-linearized invertible sheaf L on the grassmannian G/P where P in G is the parabolic subgroup stabilizing a subspace W in E. We classify the canonical filtration as P-module and as a consequence we recover known formulas on the P-module structure of the jet bundle J(L) on projective space. We study the incidence complex for the invertible sheaf O(d) on the projective line and prove it gives a resolution of the incidence scheme I(O(d)) of O(d). The aim of this study is to apply it to the study of resolutions of ideal sheaves of discriminants of invertible sheaves on grassmannians and flag varieties. We also give an elementary proof of the Cauchy formula. Hence the paper introduce the canonical filtration of an arbitrary irreducible SL(E)-module and initiates a study of the canonical filtration as P-module where P in SL(E) is a parabolic subgroup.

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