Abstract
We consider infinite dimensional Hamiltonian systems. We prove the existence of “Cantor manifolds” of elliptic tori–of any finite higher dimension–accumulating on a given elliptic KAM torus. Then, close to an elliptic equilibrium, we show the existence of Cantor manifolds of elliptic tori which are “branching” points of other Cantor manifolds of higher dimensional tori. We also answer to a conjecture of Bourgain, proving the existence of invariant elliptic tori with tangential frequency along a pre-assigned direction. The proofs are based on an improved KAM theorem. Its main advantages are an explicit characterization of the Cantor set of parameters and weaker smallness conditions on the perturbation. We apply these results to the nonlinear wave equation.
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Communicated by G. Gallavotti
Supported by the European Research Council under FP7 “New connections between dynamical systems and Hamiltonian PDEs with small divisors phenomena”.
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Berti, M., Biasco, L. Branching of Cantor Manifolds of Elliptic Tori and Applications to PDEs. Commun. Math. Phys. 305, 741–796 (2011). https://doi.org/10.1007/s00220-011-1264-3
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DOI: https://doi.org/10.1007/s00220-011-1264-3