Periodic orbits of Hamiltonian systems linear and hyperbolic at infinity
Periodic orbits of Hamiltonian systems linear and hyperbolic at infinity
We consider Hamiltonian diffeomorphisms of the Euclidean space, generated by compactly supported time-dependent perturbations of hyperbolic quadratic forms. We prove that, under some natural assumptions, such a diffeomorphism must have simple periodic orbits of arbitrarily large period when it has fixed points which are not necessary from a homological perspective.