Equivalence of the topological Anosov definition with classical hyperbolicity criteria

From papers

Let MM be a manifold and let θ\theta be a continuous flow on MM. A standard topological-hyperbolicity criterion consists of a continuous invariant splitting

TM=EθsEθuEθc,TM=E^s_\theta\oplus E^u_\theta\oplus E^c_\theta,

where EθcE^c_\theta is the one-dimensional bundle tangent to the flow orbits, together with a continuous Riemannian metric for which EθsE^s_\theta is uniformly contracted exponentially by the forward flow θt\theta_t for t>0t>0, and EθuE^u_\theta is uniformly contracted exponentially by the backward flow θt\theta_{-t} for t>0t>0.

Equivalence with classical definitions. A continuous flow θ\theta is a topological Anosov flow according to the source's definition if and only if it satisfies such standard criteria for topological hyperbolicity.

This conjecture asks whether the approximation-based definition agrees with classical intrinsic hyperbolicity. The source presents it as a fundamental connection question and gives no resolution.

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Sources & referencesView supporting material

Primary source

Stéphane Tchuiaga, “A Hofer-like Metric on the Space of Anosov Flows”, arXiv:2504.09758 (2025).

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