Quantization of hypersurface orbital varieties in sl(n)

Details Quantization of hypersurface orbital varieties in sl(n) Quantization of hypersurface orbital varieties in sl(n)

2003-11-26

arxiv.org/abs/math/0311467v1

The orbit method in geometry and physics (Marseille, 2000), 165--196, Progr. Math., 213, Birkhauser Boston, Boston, MA, 2003

Mathematics

Representation Theory

36 pages

Scientific paper

Let g be a semisimple Lie algebra with h a Cartan subalgebra. The orbit method attempts to assign representations of g to orbits in g*. Orbital varieties are particular Lagrangian subvarieties of such orbits which should lead to highest weight representations of g. It is known that all unitary highest weight representations can be obtained in this fashion. A hypersurface orbital variety is one which is of codimension 1 in the nilradical of a parabolic. Their classification for g = sl(n) obtains from general results. Recently Benlolo and Sanderson conjectured the form of the (non-linear) element describing such a variety. This paper proves that conjecture and further constructs a simple module with integral highest weight which ``quantizes'' the variety in the precise sense that the regular functions of its closure is given a g module structure compatible (up to shift by the highest weight) with its h module structure.

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