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Non-abelian convexity by symplectic cuts

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arxiv dg-ga/9603015 v1 pith:GTYAVJTT submitted 1996-03-26 dg-ga math.DG

classification dg-gamath.DG
keywords symplecticcaseconvexitymomentnon-abelianorbifoldsabelianactions
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In this paper we extend the results of Kirwan et alii on convexity properties of the moment map for Hamiltonian group actions, and on the connectedness of the fibers of the moment map, to the case of non-compact orbifolds. Our motivation is twofold. First, the category of orbifolds is important in symplectic geometry because, generically, the symplectic quotient of a symplectic manifold is an orbifold. Second, our proof is conceptually very simple since it reduces the non-abelian case to the abelian case.

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  1. Collective superintegrable systems from the Guillemin--Sternberg torus action

    math-ph 2026-08 conditional novelty 5.0 of 10

    Collective Hamiltonians of any Hamiltonian action of a compact semisimple Lie group form a superintegrable system, with action variables given by the Guillemin-Sternberg torus momentum map.

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