OpenAI reports Katok’s entropy rigidity in negative curvature

For every closed connected smooth Riemannian manifold of dimension at least three with strictly negative sectional curvature, normalized Liouville measure has maximal entropy for the geodesic flow if and only if the metric is locally symmetric.

Sources for this record

What was already known

Katok proved the surface case and higher-dimensional rigidity within the conformal class of a locally symmetric metric. The unrestricted higher-dimensional equality case remained his entropy-rigidity conjecture.

AI involvement AI-led

OpenAI credits itself as manuscript author and states that its internal frontier model produced the results in this release. Individual human input is not detailed enough to establish task-only autonomy.

OpenAI is named as author on the manuscript, and its release attributes the results to an internal frontier model. The individual human input is not detailed enough to establish autonomy.

Importance Major

Characterizes locally symmetric negatively curved metrics by maximality of Liouville entropy in all dimensions at least three.

Limitations

The statement assumes strict negative sectional curvature, closedness and dimension at least three; it is separate from volume-entropy minimization in a fixed homotopy class.

Technical verification Reported

Reported is the default when evidence for a higher level is insufficient. The OpenAI-authored manuscript reports and argues the result, but the reviewed sources do not document a completed check of the full assessed claim.

Human understanding Few

Few is the default when evidence for a higher level is insufficient. No named person is documented as explaining the central argument for this assessed contribution.

Correction and publication history

2026-10-18 · publication

Primary manuscript, attribution, and prior-work review for non-notifying local inclusion; technical verification remains Reported.

Read this published revision