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2013
Impact Factor

# Juan Pacha

Av. Diagonal 647, 08028 Barcelona, Catalonia, Spain
Departament de Matematica Aplicada I, Universitat Politecnica de Catalunya

## Publications:

 Delshams A., Gutierrez P., Koltsova O. Y., Pacha J. R. Transverse intersections between invariant manifolds of doubly hyperbolic invariant tori, via the Poincaré–Mel’nikov method 2010, vol. 15, no. 2-3, pp.  222-236 Abstract We consider a perturbation of an integrable Hamiltonian system having an equilibrium point of elliptic–hyperbolic type, having a homoclinic orbit. More precisely, we consider an $(n+2)$-degree-of-freedom near integrable Hamiltonian with $n$ centers and 2 saddles, and assume that the homoclinic orbit is preserved under the perturbation. On the center manifold near the equilibrium, there is a Cantorian family of hyperbolic KAM tori, and we study the homoclinic intersections between the stable and unstable manifolds associated to such tori. We establish that, in general, the manifolds intersect along transverse homoclinic orbits. In a more concrete model, such homoclinic orbits can be detected, in a first approximation, from nondegenerate critical points of a Mel’nikov potential. We provide bounds for the number of transverse homoclinic orbits using that, in general, the potential will be a Morse function (which gives a lower bound) and can be approximated by a trigonometric polynomial (which gives an upper bound). Keywords: hyperbolic KAM tori, transverse homoclinic orbits, Melnikov method Citation: Delshams A., Gutierrez P., Koltsova O. Y., Pacha J. R.,  Transverse intersections between invariant manifolds of doubly hyperbolic invariant tori, via the Poincaré–Mel’nikov method, Regular and Chaotic Dynamics, 2010, vol. 15, no. 2-3, pp. 222-236 DOI:10.1134/S1560354710020103