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Numerical computation of critical surfaces for the breakup of invariant tori in Hamiltonian systems

24 Sep 2021arXiv:2109.12235links table onlyarchive 2025-07-28

Adrian P. Bustamante, Cristel Chandre

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We compute the critical surface for the existence of invariant tori of a family of Hamiltonian systems with two and three degrees of freedom. We use and compare two methods to compute the critical surfaces: renormalization-group transformations and conjugation in configuration space. We unveil the presence of cusps in the critical surface for the breakup of three-dimensional invariant tori, whereas the critical surface of two-dimensional invariant tori is expected to be smooth.

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