Montaldi, James and Tokieda, Tadashi
(2003)
*Openness of momentum maps and persistence of extremal relative equilibria.*
Topology, 42.
pp. 833-844.
ISSN 0040-9383

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## Abstract

We prove that for every proper Hamiltonian action of a Lie group G in finite dimensions the momentum map is locally G-open relative to its image (i.e. images of G-invariant open sets are open). As an application we deduce that in a Hamiltonian system with continuous Hamiltonian symmetries, extremal relative equilibria persist for every perturbation of the value of the momentum map, provided the isotropy subgroup of this value is compact. We also demonstrate how this persistence result applies to an example of ellipsoidal figures of rotating fluid. We also provide an example with plane point vortices which shows how the compactness assumption is related to persistence.

Item Type: | Article |
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Uncontrolled Keywords: | Hamiltonian systems with symmetry, momentum map, reduction |

Subjects: | MSC 2010, the AMS's Mathematics Subject Classification > 37 Dynamical systems and ergodic theory MSC 2010, the AMS's Mathematics Subject Classification > 53 Differential geometry |

Depositing User: | Dr James Montaldi |

Date Deposited: | 12 Dec 2005 |

Last Modified: | 20 Oct 2017 14:12 |

URI: | https://eprints.maths.manchester.ac.uk/id/eprint/118 |

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