Abstract
According to the Weinstein splitting theorem, any Poisson manifold is locally, near any given point, a product of a symplectic manifold with another Poisson manifold whose Poisson structure vanishes at the point. Similar splitting results are known, e.g., for Lie algebroids, Dirac structures and generalized complex structures. In this paper, we develop a novel approach towards these results that leads to various generalizations, including their equivariant versions as well as their formulations in new contexts.
Funding statement: Henrique Bursztyn and Hudson Lima thank Faperj and CNPq for financial support; Eckhard Meinrenken was supported by an NSERC Discovery Grant.
A Normal bundles of vector subbundles
For a vector bundle

that is, in this diagram both horizontal and vertical arrows are vector-bundle
projections, and the horizontal and vertical scalar multiplications
commute (see [22] for this characterization of double vector bundles).
In particular, for a submanifold

The tangent bundle to

Lemma A.1.
There is a natural map
Proof.
Let

There is a canonical involution
For a submanifold

The involution

as desired. ∎
Acknowledgements
We would like to thank David Li-Bland, Pedro Frejlich, Ioan Mărcuţ and Shlomo Sternberg, for helpful comments on various aspects of our work. We also thank the anonymous referee for his/her comments and suggestions.
References
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Articles in the same Issue
- Frontmatter
- 𝒟-modules arithmétiques sur la variété de drapeaux
- Nodal length of Steklov eigenfunctions on real-analytic Riemannian surfaces
- Kazhdan projections, random walks and ergodic theorems
- Towers of GL($r$)-type of modular curves
- Donaldson–Thomas invariants versus intersection cohomology of quiver moduli
- Volterra operators on Hardy spaces of Dirichlet series
- Mean curvature flow of noncompact hypersurfaces with Type-II curvature blow-up
- Non-arithmetic lattices and the Klein quartic
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Articles in the same Issue
- Frontmatter
- 𝒟-modules arithmétiques sur la variété de drapeaux
- Nodal length of Steklov eigenfunctions on real-analytic Riemannian surfaces
- Kazhdan projections, random walks and ergodic theorems
- Towers of GL($r$)-type of modular curves
- Donaldson–Thomas invariants versus intersection cohomology of quiver moduli
- Volterra operators on Hardy spaces of Dirichlet series
- Mean curvature flow of noncompact hypersurfaces with Type-II curvature blow-up
- Non-arithmetic lattices and the Klein quartic
- Splitting theorems for Poisson and related structures