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• W1716010956 abstract "The standard Poisson structures on the flag varieties G/P of a complex reductive algebraic group G are investigated. It is shown that the orbits of symplectic leaves in G/P under a fixed maximal torus of G are smooth irreducible locally closed subvarieties of G/P, isomorphic to intersections of dual Schubert cells in the full flag variety G/B of G, and their Zariski closures are explicitly computed. Two different proofs of the former result are presented. The first is in the framework of Poisson homogeneous spaces and the second one uses an idea of weak splittings of surjective Poisson submersions, based on the notion of Poisson-Dirac submanifolds. For a parabolic subgroup P with abelian unipotent radical (in which case G/P is a Hermitian symmetric space of compact type), it is shown that all orbits of the standard Levi factor L of P on G/P are complete Poisson subvarieties which are quotients of L, equipped with the standard Poisson structure. Moreover, it is proved that the Poisson structure on G/P vanishes at all special base points for the L-orbits on G/P constructed by Richardson, Rohrle, and Steinberg." @default.
• W1716010956 created "2016-06-24" @default.
• W1716010956 creator A5082849061 @default.
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• W1716010956 date "2005-09-04" @default.
• W1716010956 modified "2023-09-27" @default.
• W1716010956 title "Poisson structures on affine spaces and flag varieties. II. General case" @default.
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