Newton polyhedra and Poisson structures from certain linear Hamiltonian circle actions

Details Newton polyhedra and Poisson structures from certain linear Hamiltonian circle actions Newton polyhedra and Poisson structures from certain linear Hamiltonian circle actions

2004-11-18

arxiv.org/abs/math/0411398v1

Mathematics

Symplectic Geometry

16 pages, 1 figure

Scientific paper

In this paper we first describe the geometry of the Newton polyhedra of polynomials invariant under certain linear Hamiltonian circle actions. From the geometry of the polyhedra, various Poisson structures on the orbit spaces of the actions are derived and Poisson embeddings into model spaces, for the orbit spaces, are constructed. The Poisson structures, on respective source and model space, are compatible even for the minimum possible (embedding) dimension of the model spaces. This is, in particular, important since it is still an open question if, in general, there exist finite dimensional model spaces with Poisson structures compatible with the actions and the usual nondegenerate Poisson structure on the source spaces.

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