Abstract
We consider a system of rotators subject to a small quasi-periodic forcing. We require the forcing to be analytic and satisfy a time-reversibility property and we assume its frequency vector to be Bryuno. Then we prove that, without imposing any non-degeneracy condition on the forcing, there exists at least one quasi-periodic solution with the same frequency vector as the forcing. The result can be interpreted as a theorem of persistence of lower-dimensional tori of arbitrary codimension in degenerate cases.
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Partially supported by the European Research Council under FP7 “Hamiltonian PDEs and small divisor problems: a dynamical systems approach”.
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Corsi, L., Gentile, G. Resonant tori of arbitrary codimension for quasi-periodically forced systems. Nonlinear Differ. Equ. Appl. 24, 3 (2017). https://doi.org/10.1007/s00030-016-0425-7
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DOI: https://doi.org/10.1007/s00030-016-0425-7