Source: Duke Math. J. Volume 123, Number 3
(2004), 549-607.
Given a Lie groupoid G over a manifold M, we show that
multiplicative 2-forms on G relatively closed with respect to
a closed 3-form ϕ; on M correspond to maps from the Lie
algebroid of G into T*M satisfying an algebraic condition and
a differential condition with respect to the ϕ-twisted
Courant bracket. This correspondence describes, as a special case,
the global objects associated to ϕ-twisted Dirac structures.
As applications, we relate our results to equivariant cohomology
and foliation theory, and we give a new description of
quasi-Hamiltonian spaces and group-valued momentum maps.
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