Abstract
We associate cotangent models to a neighbourhood of a Liouville torus in symplectic and Poisson manifolds focusing on b-Poisson/b-symplectic manifolds. The semilocal equivalence with such models uses the corresponding action-angle theorems in these settings: the theorem of Liouville–Mineur–Arnold for symplectic manifolds and an action-angle theorem for regular Liouville tori in Poisson manifolds (Laurent- Gengoux et al., IntMath Res Notices IMRN 8: 1839–1869, 2011). Our models comprise regular Liouville tori of Poisson manifolds but also consider the Liouville tori on the singular locus of a b-Poisson manifold. For this latter class of Poisson structures we define a twisted cotangent model. The equivalence with this twisted cotangent model is given by an action-angle theorem recently proved by the authors and Scott (Math. Pures Appl. (9) 105(1):66–85, 2016). This viewpoint of cotangent models provides a new machinery to construct examples of integrable systems, which are especially valuable in the b-symplectic case where not many sources of examples are known. At the end of the paper we introduce non-degenerate singularities as lifted cotangent models on b-symplectic manifolds and discuss some generalizations of these models to general Poisson manifolds.
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Communicated by P. Deift
A. Kiesenhofer and E. Miranda are supported by the Grants Reference Number MTM2015-69135-P (MINECO/FEDER) and Reference Number 2014SGR634 (AGAUR). A. Kiesenhofer is supported by a UPC doctoral grant.
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Kiesenhofer, A., Miranda, E. Cotangent Models for Integrable Systems. Commun. Math. Phys. 350, 1123–1145 (2017). https://doi.org/10.1007/s00220-016-2720-x
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DOI: https://doi.org/10.1007/s00220-016-2720-x