The Hamiltonian Tube Of A Cotangent-Lifted Action
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arXiv
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| Format: | Preprint |
| Published: |
2014
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| _version_ | 1866917898807672832 |
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| author | Rodriguez-Olmos, Miguel Teixidó-Román, Miguel |
| author_facet | Rodriguez-Olmos, Miguel Teixidó-Román, Miguel |
| contents | The Marle-Guillemin-Sternberg (MGS) form is local model for a neighborhood of an orbit of a Hamiltonian Lie group action on a symplectic manifold. One of the main features of the MGS form is that it puts simultaneously in normal form the existing symplectic structure and momentum map. The main drawback of the MGS form is that it does not have an explicit expression. We will obtain a MGS form for cotangent- lifted actions on cotangent bundles that, in addition to its defining features, respects the additional fibered structure present. This model generalizes previous results obtained by T. Schmah for orbits with fully-isotropic momentum. In addition, our construction is explicit up to the integration of a differential equation on $G$. This equation can be easily solved for the groups $SO(3)$ or $SL(2)$, thus giving explicit symplectic coordinates for arbitrary canonical actions of these groups on any cotangent bundle. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_1410_3697 |
| institution | arXiv |
| publishDate | 2014 |
| record_format | arxiv |
| spellingShingle | The Hamiltonian Tube Of A Cotangent-Lifted Action Rodriguez-Olmos, Miguel Teixidó-Román, Miguel Symplectic Geometry 53D20, 70H33, 37J15 The Marle-Guillemin-Sternberg (MGS) form is local model for a neighborhood of an orbit of a Hamiltonian Lie group action on a symplectic manifold. One of the main features of the MGS form is that it puts simultaneously in normal form the existing symplectic structure and momentum map. The main drawback of the MGS form is that it does not have an explicit expression. We will obtain a MGS form for cotangent- lifted actions on cotangent bundles that, in addition to its defining features, respects the additional fibered structure present. This model generalizes previous results obtained by T. Schmah for orbits with fully-isotropic momentum. In addition, our construction is explicit up to the integration of a differential equation on $G$. This equation can be easily solved for the groups $SO(3)$ or $SL(2)$, thus giving explicit symplectic coordinates for arbitrary canonical actions of these groups on any cotangent bundle. |
| title | The Hamiltonian Tube Of A Cotangent-Lifted Action |
| topic | Symplectic Geometry 53D20, 70H33, 37J15 |
| url | https://arxiv.org/abs/1410.3697 |