Closed orbits of a charge in a weakly exact magnetic field

Details Closed orbits of a charge in a weakly exact magnetic field Closed orbits of a charge in a weakly exact magnetic field

2009-06-05

arxiv.org/abs/0906.1192v3

Published with less typos in PJM, Vol. 247 (2010), No. 1, 189-212

Mathematics

Dynamical Systems

25 pages. v3 - minor corrections, this version to appear in PJM

Scientific paper

We prove that for a weakly exact magnetic system on a closed connected Riemannian manifold, almost all energy levels contain a closed orbit. More precisely, we prove the following stronger statements. Let $(M,g)$ denote a closed connected Riemannian manifold and $\sigma$ a weakly exact 2-form. Let $\phi_{t}$ denote the magnetic flow determined by $\sigma$, and let $c$ denote the Mane critical value of the pair $(g,\sigma)$. We prove that if $k>c$, then for every non-trivial free homotopy class of loops on $M$ there exists a closed orbit with energy $k$ whose projection to $M$ belongs to that free homotopy class. We also prove that for almost all $k

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