A polytope combinatorics for semisimple groups

Details A polytope combinatorics for semisimple groups A polytope combinatorics for semisimple groups

2001-10-19

arxiv.org/abs/math/0110225v1

Mathematics

Algebraic Geometry

17 pages, 10 figures

Scientific paper

Mirkovic and Vilonen discovered a canonical basis of algebraic cycles for the intersection homology of (the closures of the strata of) the loop Grassmannian. The moment map images of these varieties are a collection of polytopes, and they may be used to compute weight multiplicities and tensor product multiplicities for representations of a semisimple group. The polytopes are explicitly described for a few low rank groups.

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