11 citations · 25 across the 9 of their papers we have counts for
4 papers · 1 filter
Momentum Maps and Morita Equivalence
Ping Xu
We introduce quasi-symplectic groupoids and explain their relation with momentum map theories. This approach enables us to unify into a single framework various momentum map theori…
Equivariant gerbes over compact simple Lie groups
Kai Behrend, Ping Xu, Bin Zhang
Using groupoid -central extensions, we present, for a compact simple Lie group , an infinite dimensional model of -gerbe over the differential stack whose Dixmie…
S^1-bundles and gerbes over differentiable stacks
Kai Behrend, Ping Xu
We study -bundles and -gerbes over differentiable stacks in terms of Lie groupoids, and construct Chern classes and Dixmier-Douady classes in terms of analogues of connec…
Twisted K-theory of differentiable stacks
Jean-Louis Tu, Ping Xu, Camille Laurent-Gengoux
In this paper, we develop twisted -theory for stacks, where the twisted class is given by an -gerbe over the stack. General properties, including the Mayer-Vietoris propert…