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arXiv 1108.5960math.RTmath.QAmath.RA
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Demazure模块和Weyl模块:扭曲的电流情况

Demazure modules and Weyl modules: The twisted current case

Ghislain Fourier, Deniz Kus

摘要:

研究了扭流代数的有限维表示,证明了扭仿射Kac-Moody代数的任意阶化扭Weyl模同构于一级Demazure模.利用Demazure模的张量积性质,通过对基本Weyl模的分析,得到了其维数和特征标公式.证明了分次扭Weyl模可以通过取Weyl模的相伴分次模分次模作为loop代数得到,这意味着它的维数和经典特征与支集无关,只依赖于它的经典最高权.这些结果是已知的untwisted电流代数之前,是新的所有扭曲类型。

英文摘要:

We study finite-dimensional respresentations of twisted current algebras and show that any graded twisted Weyl module is isomorphic to level one Demazure module for the twisted affine Kac-Moody algebra. Using the tensor product property of Demazure modules, we obtain, by analyzing the fundamental Weyl modules, dimension and character formulas. Moreover we prove that graded twisted Weyl modules can be obtained by taking the associated graded modules of Weyl modules for the loop algebra, which implies that its dimension and classical character are independent of the support and depend only on its classical highest weight. These results were known before for untwisted current algebras and are new for all twisted types.

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