Abstract
The existence of lower dimensional KAM tori is shown for a class of nearly integrable Hamiltonian systems of infinite dimensions where the second Melnikov’s conditions are completely eliminated and the algebraic structure of the normal frequencies are not needed. As a consequence, it is proved that there exist many invariant tori and thus quasi-periodic solutions for nonlinear wave equations, Schrödinger equations and other equations of any spatial dimensions.
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Communicated by G. Gallavotti.
Supported by NNSFC and NCET-04-0365 and STCSM-06ZR14014.
An erratum to this article is available at http://dx.doi.org/10.1007/s00220-011-1283-0.
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Yuan, X. A KAM Theorem with Applications to Partial Differential Equations of Higher Dimensions. Commun. Math. Phys. 275, 97–137 (2007). https://doi.org/10.1007/s00220-007-0287-2
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DOI: https://doi.org/10.1007/s00220-007-0287-2