KAM theory and a partial justification of Greene's criterion for non-twist maps
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hdl:2117/1191
Tipus de documentArticle
Data publicació1999
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Abstract
We consider perturbations of integrable area preserving non twist maps of the annulus those
are maps in which the twist condition changes sign These maps appear in a variety of applications notably
transport in atmospheric Rossby waves
We show in suitable parameter families the persistence of critical circles invariant circles whose
rotation number is the maximum of all the rotation numbers of points in the map with Diophantine rotation
number The parameter values with critical circles of frequency lie on a one dimensional analytic curve
Furthermore we show a partial justication of Greenes criterion If analytic critical curves with Dio
phantine rotation number exist the residue of periodic orbits that is one fourth of the trace of the
derivative of the return map minus with rotation number converging to converges to zero exponen
tially fast We also show that if analytic curves exist there should be periodic orbits approximating them
and indicate how to compute them
These results justify in particular conjectures put forward on the basis of numerical evidence in D del
Castillo et al Phys D
The proof of both results relies on the successive application of an
iterative lemma which is valid also for d dimensional exact symplectic di eomorphisms The proof of this
iterative lemma is based on the deformation method of singularity theory
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