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Normal forms for analytic Poisson structures. (English) Zbl 0553.58004
The paper addresses the question of finding local coordinates in a Poisson manifold in which the expression of the Poisson structure is particularly simple. The splitting theorem gives rise to Darboux coordinates plus a third set of coordinates in which the Poisson tensor vanishes at zero. The paper proves that if the Poisson structure is real analytic or holomorphic and if the Lie algebra whose structure constants are the first derivatives of the Poisson tensor with respect to the third set of variables is semisimple, then locally, the Poisson tensor is the sum of a symplectic part plus a Lie-Poisson part. The key techniques of the paper are Lie algebra cohomology and a KAM-type accelerated convergence method.
Reviewer: T.Ratiu

##### MSC:
 58A10 Differential forms in global analysis 58A15 Exterior differential systems (Cartan theory) 58H99 Pseudogroups, differentiable groupoids and general structures on manifolds 17B56 Cohomology of Lie (super)algebras
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