An Approximate KAM-Renormalization-Group Scheme for Hamiltonian Systems

Details An Approximate KAM-Renormalization-Group Scheme for Hamiltonian Systems An Approximate KAM-Renormalization-Group Scheme for Hamiltonian Systems

1998-05-22

arxiv.org/abs/chao-dyn/9805019v1

J. Stat. Phys. 94, 241 (1999).

Nonlinear Sciences

Chaotic Dynamics

6 pages, RevTeX

Scientific paper

We construct an approximate renormalization scheme for Hamiltonian systems with two degrees of freedom. This scheme is a combination of Kolmogorov-Arnold-Moser (KAM) theory and renormalization-group techniques. It makes the connection between the approximate renormalization procedure derived by Escande and Doveil, and a systematic expansion of the transformation. In particular, we show that the two main approximations, consisting in keeping only the quadratic terms in the actions and the two main resonances, keep the essential information on the threshold of the breakup of invariant tori.

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