Universal lifting theorem and quasi-Poisson groupoids

Details Universal lifting theorem and quasi-Poisson groupoids Universal lifting theorem and quasi-Poisson groupoids

2005-07-19

arxiv.org/abs/math/0507396v1

Mathematics

Differential Geometry

46 pages

Scientific paper

We prove the universal lifting theorem: for an $\alpha$-simply connected and $\alpha$-connected Lie groupoid $\gm$ with Lie algebroid $A$, the graded Lie algebra of multi-differentials on $A$ is isomorphic to that of multiplicative multi-vector fields on $\gm$. As a consequence, we obtain the integration theorem for a quasi-Lie bialgebroid, which generalizes various integration theorems in the literature in special cases. The second goal of the paper is the study of basic properties of quasi-Poisson groupoids. In particular, we prove that a group pair $(D, G)$ associated to a Manin quasi-triple $(\mathfrak d, \mathfrak g, \mathfrak h)$ induces a quasi-Poisson groupoid on the transformation groupoid $G\times D/G\toto D/G$. Its momentum map corresponds exactly with the $D/G$-momentum map of Alekseev and Kosmann-Schwarzbach.

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