A multidimensional birkhoff theorem for time-dependent tonelli hamiltonians
Un théorème de Birkhoff multidimensionnel pour les hamiltoniens de Tonelli dépendant du temps
Abstract
Let M be a closed and connected manifold, H : T * M × R/Z → R a Tonelli 1-periodic Hamiltonian and L ⊂ T * M a Lagrangian submanifold Hamiltonianly isotopic to the zero section. We prove that if L is invariant by the time-one map of H, then L is a graph over M. An interesting consequence in the autonomous case is that in this case, L is invariant by all the time t maps of the Hamiltonian flow of H.
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