Partially hyperbolic and transitive dynamics generated by heteroclinic cycles (Q2709590)

The authors study \(C^k\) diffeomorphisms, \(k \geq 1\), \(f :M \rightarrow M\), where \(M\) is a compact and smooth boundaryless manifold, exhibiting heterodimensional cycles (i.e. cycles containing periodic points of different stable indices). They prove that if \(f\) can not be \(C^k\) approximated by diffeomorphisms with homoclinic tangencies, then \(f\) is in the closure of an open set \({\mathcal U} \subset \text{Diff}^k(M)\) consisting of diffeomorphisms \(g\) with a non-hyperbolic transitive set \(\Lambda_g\) which is locally maximal and strongly partially hyperbolic. As a consequence, in the case of 3-dimensional manifolds, they give new examples of open sets of \(C^1\) diffeomorphisms for which residually infinitely sinks and sources coexist. They also prove that the occurence of non-hyperbolic dynamics has persistent character in the unfolding of heterodimensional cycles.