Manin Pairs and Moment Maps
Manin Pairs and Moment Maps
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DOI:
10.4310/jdg/1090347528
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发表时间:
1999-09
影响因子:
2.5
通讯作者:
A. Alekseev;Y. Kosmann-Schwarzbach
中科院分区:
文献类型:
--
作者:
A. Alekseev;Y. Kosmann-Schwarzbach
A Lie group $G$ in a group pair ($D, G$), integrating the Lie algebra $\mathfrak{g}$ in a Manin pair ($\mathfrak{d,g}$), has a quasi-Poisson structure. We define the quasi-Poisson actions of such Lie groups $G$, and show that they generalize the Poisson actions of Poisson Lie groups. We define and study the moment maps for those quasi-Poisson actions which are hamiltonian. These moment maps take values in the homogeneous space $D/G$. We prove an analogue of the hamiltonian reduction theorem for quasi-Poisson group actions, and we study the symplectic leaves of the orbit spaces of hamiltonian quasi-Poisson spaces.