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arXiv · 2111.02556

"Large" strange attractors in the unfolding of a heteroclinic attractor

Alexandre A. P. Rodrigues
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Abstract

In this paper we present a mechanism for the emergence of strange attractors in a one-parameter family of differential equations acting on a 3-dimensional sphere. When the parameter is zero, its flow exhibits an attracting heteroclinic network (Bykov network) made by two 1-dimensional connections and one 2-dimensional separatrix between hyperbolic saddles-foci with different Morse indices. After slightly increasing the parameter, while keeping the 1-dimensional connections unaltered, we concentrate our study in the case where the 2-dimensional invariant manifolds of the equilibria do not intersect. We will show that, for a set of parameters close enough to zero with positive Lebesgue measure, the dynamics exhibits strange attractors winding around an annulus in the phase space, supporting Sinai-Ruelle-Bowen (SRB) measures. We prove the existence of a sequence of parameter values for which the family exhibits a superstable sink. We also characterise the transition from a Bykov network to a strange attractor.

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Alexandre A. P. Rodrigues. 2021-11-03. "Large" strange attractors in the unfolding of a heteroclinic attractor. https://arxiv.org/abs/2111.02556

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