Non-uniformly hyperbolic horseshoes arising from bifurcations of Poincaré heteroclinic cycles
Publications Mathématiques de l'IHÉS, Volume 110 (2009), pp. 1-217.

In the present paper, we advance considerably the current knowledge on the topic of bifurcations of heteroclinic cycles for smooth, meaning C ∞, parametrized families {g t ∣t∈ℝ} of surface diffeomorphisms. We assume that a quadratic tangency q is formed at t=0 between the stable and unstable lines of two periodic points, not belonging to the same orbit, of a (uniformly hyperbolic) horseshoe K (see an example at the Introduction) and that such lines cross each other with positive relative speed as the parameter evolves, starting at t=0 and the point q. We also assume that, in some neighborhood W of K and of the orbit of tangency o(q), the maximal invariant set for g 0=g t=0 is K∪o(q), where o(q) denotes the orbit of q for g 0. We then prove that, when the Hausdorff dimension HD(K) is bigger than one, but not much bigger (see (H.4) in Section 1.2 for a precise statement), then for most t, |t| small, g t is a non-uniformly hyperbolic horseshoe in W, and so g t has no attractors in W. Most t, and thus most g t , here means that t is taken in a set of parameter values with Lebesgue density one at t=0.

@article{PMIHES_2009__110__1_0,
     author = {Palis, Jacob and Yoccoz, Jean-Christophe},
     title = {Non-uniformly hyperbolic horseshoes arising from bifurcations of {Poincar\'e} heteroclinic cycles},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {1--217},
     publisher = {Springer-Verlag},
     volume = {110},
     year = {2009},
     doi = {10.1007/s10240-009-0023-x},
     zbl = {1181.37024},
     mrnumber = {2551484},
     language = {en},
     url = {http://www.numdam.org/articles/10.1007/s10240-009-0023-x/}
}
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Palis, Jacob; Yoccoz, Jean-Christophe. Non-uniformly hyperbolic horseshoes arising from bifurcations of Poincaré heteroclinic cycles. Publications Mathématiques de l'IHÉS, Volume 110 (2009), pp. 1-217. doi : 10.1007/s10240-009-0023-x. http://www.numdam.org/articles/10.1007/s10240-009-0023-x/

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