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Paper detail

Coadjoint orbitopes

We study coadjoint orbitopes, i.e. convex hulls of coadjoint orbits of a compact Lie group. We show that all the faces of such an orbitope are exposed. The face structure is studied by means of the momentum map and it is shown that every face is again a coadjoint orbitope. Up to conjugation the faces are completely determined by the momentum polytope and can be described in a simple way in terms of root data. Finally we consider the complex geometry of the coadjoint orbit and we prove that the submanifolds of the orbit that are extreme sets of a face are exactly the closed orbits of parabolic subgroups.

preprint2013arXivOpen access
Leonardo BiliottiAlessandro GhigiPeter Heinzner
math.RTmath.SG
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Leonardo BiliottiAlessandro GhigiPeter Heinzner

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