Non-contractible periodic orbits of Hamiltonian flows on twisted cotangent bundles

Details Non-contractible periodic orbits of Hamiltonian flows on twisted cotangent bundles Non-contractible periodic orbits of Hamiltonian flows on twisted cotangent bundles

2003-12-03

arxiv.org/abs/math/0312074v2

Mathematics

Dynamical Systems

v2. 17 pages, 2 figures. Proof of Proposition 1 rewritten and corrected. One reference added

Scientific paper

For many classes of symplectic manifolds, the Hamiltonian flow of a function with sufficiently large variation must have a fast periodic orbit. This principle is the base of the notion of Hofer-Zehnder capacity and some other symplectic invariants and leads to numerous results concerning existence of periodic orbits of Hamiltonian flows. Along these lines, we show that given a negatively curved manifold M, a neigbhourhood U of M in the cotangent bundle, a sufficiently small magnetic field and a non-trivial free homotopy class of loops, then the magnetic flow of a Hamiltonian with big enough variation has a one-periodic orbit in that class. As a consequence, we obtain estimates for the relative Hofer-Zehnder capacity and the Biran-Polterovich-Salamon capacity of a neighbourhood of M.

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