Momentum Mappings And Reduction of Poisson Actions

  • Jiang-Hua Lu
Part of the Mathematical Sciences Research Institute Publications book series (MSRI, volume 20)


An action σ: G × PP of a Poisson Lie group G on a Poisson manifold P is called a Poisson action if σ is a Poisson map. It is believed that Poisson actions should be used to understand the “hidden symmetries” of certain integrable systems [STS2]. If the Poisson Lie group G has the zero Poisson structure, then σ being a Poisson action is equivalent to each transformation σg: PP for gG preserving the Poisson structure on P. In this case, if the orbit space G \ P is a smooth manifold, it has a reduced Poisson structure such that the projection map PG \ P is a Poisson map. If P is symplectic and if the action σ is generated by an equivariant momentum mapping J: Pg*, the reduction procedure of Meyer [Me] and Marsden and Weinstein [Ms-We] gives a way of describing the symplectic leaves of G \ P as the quotients Pµ := Gµ \J−1(µ), where µg* and GµG is the coadjoint isotropy subgroup of µ.


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Copyright information

© Springer-Verlag New York, Inc. 1991

Authors and Affiliations

  • Jiang-Hua Lu
    • 1
  1. 1.Department of MathematicsUniversity of California at BerkeleyBerkeleyUSA
  2. 2.Department of MathematicsMITCambridgeUSA

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