Another note on focus-focus singularities

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We show a natural relation between the monodromy formula for focus-focus singularities of integrable Hamiltonian systems and a formula of Duistermaat-Heckman, and extend the main results of our previous note on focus-focus singularities ($\bbS^1$-action, monodromy, and topological classification) to the degenerate case. We also consider the non-Hamiltonian case, local normal forms, etc.
final version, to appear in Lett. Math. Phys

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Dynamical Systems, Differential Geometry, 58F07,70H05

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http://salesiana.dossiersoluciones.com/handle/123456789/62391

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0110148
 http://arxiv.org/abs/math/0110148

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arXiv