Differentiable and algebroid cohomology,Van Est isomorphisms,and characteristic classes |
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Authors: | Marius Crainic |
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Institution: | (1) Department of Mathematics, Utrecht University, 80.010, 3508 TA Utrecht, The Netherlands |
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Abstract: | In the first section we discuss Morita invariance of
differentiable/algebroid cohomology.In the second section we extend the Van Est isomorphism to
groupoids. As a first application we clarify the connection
between differentiable and algebroid cohomology (proved in
degree 1, and conjectured in degree 2 by Weinstein-Xu
50]). As a second application we extend Van Ests
argument for the integrability of Lie algebras. Applied to
Poisson manifolds, this immediately implies the integrability
criterion of Hector-Dazord 14].In the third section we describe the relevant characteristic classes of
representations, living in algebroid cohomology, as well as
their relation to the Van Est map. This extends
Evens-Lu-Weinsteins characteristic class $\theta_{L}$
20] (hence, in particular, the modular class of Poisson
manifolds), and also the classical characteristic classes of
flat vector bundles 2, 30].In the last section we
describe applications to Poisson geometry. |
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Keywords: | 58H05 57R20 53D17 |
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