We prove the universal lifting theorem: for an -simply connected and -connected Lie groupoid with Lie algebroid , the graded Lie algebra of multi-differentials on is isomorphic to that of multiplicative multi-vector fields on . 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 associated to a Manin quasi-triple induces a quasi-Poisson groupoid on the transformation groupoid . Its momentum map corresponds exactly with the -momentum map of Alekseev and Kosmann-Schwarzbach.
Cite this article
David Iglesias-Ponte, Camille Laurent-Gengoux, Ping Xu, Universal lifting theorem and quasi-Poisson groupoids. J. Eur. Math. Soc. 14 (2012), no. 3, pp. 681–731DOI 10.4171/JEMS/315