RT Journal Article T1 Periodic orbits of Hamiltonian systems and symplecticreduction A1 Ibort, A. A1 Martínez Ontalba, Celia AB The notion of relative periodic orbits for Hamiltonian systems with symmetry is discussed and a correspondence between periodic orbits of reduced and unreduced Hamiltoniansystems is established. Variational principles with symmetries are studied from the point of view of symplectic reduction of the space of loops, leading to a characterization of reduced periodic orbits by means of the critical subsets of an action functional restricted to a submanifold of the loop space of the unreduced manifold. Finally, as an application, it is shown that if thesymplectic form ! has finite integral rank, then the periodic orbits of a Hamiltonian system on the symplectic manifold .M; !/ admit a variational characterization. PB IOP Publishing SN 0305-4470 YR 1996 FD 1996 LK https://hdl.handle.net/20.500.14352/57627 UL https://hdl.handle.net/20.500.14352/57627 LA eng NO CICYT NO NATO DS Docta Complutense RD 13 may 2025