Complete families of commuting functions for coisotropic Hamiltonian actions

Details Complete families of commuting functions for coisotropic Hamiltonian actions Complete families of commuting functions for coisotropic Hamiltonian actions

2005-11-20

arxiv.org/abs/math/0511498v2

Mathematics

Symplectic Geometry

Scientific paper

Let G be an algebraic group over a field F of characteristic zero, with Lie algebra g=Lie(G). The dual space g^* equipped with the Kirillov bracket is a Poisson variety and each irreducible G-invariant subvariety X\subset g^* carries the induced Poisson structure. We prove that there is a family of algebraically independent polynomial functions {f_1,...f_l} on X, which pairwise commute with respect to the Poisson bracket and such that l=(dim X+tr.deg F(X)^G)/2. We also discuss several applications of this result to complete integrability of Hamiltonian systems on symplectic Hamiltonian G-varieties of corank zero and 2.

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