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Viscosity solutions methods for converse KAM theory

Published online by Cambridge University Press:  25 September 2008

Diogo A. Gomes
Affiliation:
Instituto Superior Tecnico, Department of Mathematics, Av. Rovisco Pais, 1049-001 Lisboa, Portugal. dgomes@math.ist.utl.pt
Adam Oberman
Affiliation:
Instituto Superior Tecnico, Department of Mathematics, Av. Rovisco Pais, 1049-001 Lisboa, Portugal. dgomes@math.ist.utl.pt
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Abstract

The main objective of this paper is to provenew necessary conditions to the existence ofKAM tori. To do so, we develop a set ofexplicit a-priori estimates for smoothsolutions of Hamilton-Jacobi equations,using a combination of methods fromviscosity solutions,KAM and Aubry-Mather theories.These estimatesare validin anyspace dimension, and can be checked numericallyto detect gaps between KAM tori and Aubry-Mather sets.We apply these results to detect non-integrable regions in several examples such as a forced pendulum, two coupled penduli, andthe double pendulum.

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Type
Research Article
Copyright
© EDP Sciences, SMAI, 2008

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