Regular representation on the big cell and big projective modules in the category O

Details Regular representation on the big cell and big projective modules in the category O Regular representation on the big cell and big projective modules in the category O

2004-10-27

arxiv.org/abs/math/0410588v1

Mathematics

Representation Theory

24 pages

Scientific paper

We study the algebra of regular functions on the big cell of the Gauss decomposition of a simple complex Lie group G. We prove that it is spanned by the matrix elements of big projective modules in the BGG category O, and admits a decomposition of Peter-Weyl type. The subspace of Whittaker vectors in the regular representation on the big cell gives a realization of the big projective modules in O, similar to the Borel-Weil theorem. These results can be extended to the quantum groups.

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