Dual Lindstedt series and KAM theorem

Details Dual Lindstedt series and KAM theorem Dual Lindstedt series and KAM theorem

2009-05-29

arxiv.org/abs/0905.4886v2

J. Math. Phys. 50, 102904 (2009)

Physics

Mathematical Physics

7 pages, 4 figures. Revised version accepted for publication in Journal of Mathematical Physics

Scientific paper

10.1063/1.3250190

We prove that exists a Lindstedt series that holds when a Hamiltonian is driven by a perturbation going to infinity. This series appears to be dual to a standard Lindstedt series as it can be obtained by interchanging the role of the perturbation and the unperturbed system. The existence of this dual series implies that a dual KAM theorem holds and, when a leading order Hamiltonian exists that is non degenerate, the effect of tori reforming can be observed with a system passing from regular motion to fully developed chaos and back to regular motion with the reappearance of invariant tori. We apply these results to a perturbed harmonic oscillator proving numerically the appearance of tori reforming. Tori reforming appears as an effect limiting chaotic behavior to a finite range of parameter space of some Hamiltonian systems. Dual KAM theorem, as proved here, applies when the perturbation, combined with a kinetic term, provides again an integrable system.

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