Díaz–Gorodetski global non-hyperbolic measure conjecture

From papers

Let MM be a compact smooth manifold without boundary, and let Diffr(M)\operatorname{Diff}^r(M) denote the space of CrC^r diffeomorphisms of MM, where r1r\geq 1. An invariant measure is non-hyperbolic if it has a vanishing Lyapunov exponent. Díaz–Gorodetski's conjecture. There is an open dense subset UDiffr(M)\mathcal{U}\subset\operatorname{Diff}^r(M) where r1r\geq 1, such that every diffeomorphism fUf\in\mathcal{U} either is uniformly hyperbolic or has an ergodic non-hyperbolic invariant measure. The paper states this as a typical-dynamics version of the converse to the implication that a non-hyperbolic ergodic measure rules out uniform hyperbolicity, and later says that it has not been resolved there.

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Primary source

Cheng Cheng, Sylvain Crovisier, Shaobo Gan, Xiaodong Wang and Dawei Yang, “Hyperbolicity versus non-hyperbolic ergodic measures inside homoclinic classes”, arXiv:1507.08253 (2015).

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