Computation of Weyl groups of G-varieties

Details Computation of Weyl groups of G-varieties Computation of Weyl groups of G-varieties

2006-12-19

arxiv.org/abs/math/0612559v2

Representation Theory, 14(2010), 9-69

Mathematics

Algebraic Geometry

82 pages, v2 56 pages, the paper is rewritten: all material related to Hamiltonian actions was removed to AG/0701823v2, AG/070

Scientific paper

Let G be a connected reductive group. To any irreducible G-variety one associates a certain linear group generated by reflections called the Weyl group. Weyl groups play an important role in the study of embeddings of homogeneous spaces. We establish algorithms for computing Weyl groups for homogeneous spaces and affine homogeneous vector bundles. For some special classes of G-varieties (affine homogeneous vector bundles of maximal rank, affine homogeneous spaces, homogeneous spaces of maximal rank with discrete group of central automorphisms) we compute Weyl groups more or less explicitly.

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