arXiv:2606.30939v1

Chaos on surfaces and beyond: a new notion of dynamical hyperbolicity

Jérôme Buzzi

math.DS37C4028D2037A2537B1037D2537D3537E30

Abstract

We present some developments in the study of chaotic dynamics following the solution of a conjecture of Newhouse on the measures maximizing the entropy of smooth surface diffeomorphisms. We focus on strong positive recurrence, a generalization of the classical Anosov-Smale theory of uniform hyperbolicity introduced in a joint work with Sylvain Crovisier and Omri Sarig. This new property is general enough to be satisfied by all smooth surface diffeomorphisms with positive entropy, yet it still ensures many quantitative properties such as exponential mixing or limit theorems for regular functions. We also present some open problems, including its abundance (or not) in higher dimensions.

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Audit summary

Audited against arXiv v1

Not a correctness certificate. A “Correct” result may include yellow typos or minor formal corrections that do not affect substantive soundness. It means this audit found no unresolved substantive error under the stated criteria; it does not replace expert scrutiny or formal verification.

Current report

Detailed mathematical audit

Generated August 18, 2026
01Statements3 reported findingsCorrect

This ICM survey's statements on strong positive recurrence, smooth surface diffeomorphisms, homoclinic classes, symbolic codings, and statistical consequences correctly reproduce the cited results. Two obvious textual placeholders or symbol slips do not affect mathematical status.

Theorems 3.1, 3.4, 4.12, and 5.1Correct

The SPR synthesis preserves the hypotheses of the source theorems

Sections 3–6 · arXiv:2606.30939v1

Positive entropy and CC^\infty smoothness are retained in the surface theorem, Borel homoclinic classes are used where uniqueness is asserted, and irreducibility and period conditions accompany the Markov-shift consequences. The exponential-mixing and limit-theorem claims are made for the SPR maximal-entropy measures in the regimes supplied by the cited coding results.

Full ICM survey, version 1
Section 2.1 and Remark 2.11Typo

Two uniquely recoverable typesetting slips

Pages 2 and 5 · structural-stability sentence and Remark 2.11 · arXiv:2606.30939v1

The conjugacy formula is printed with ff instead of hh in the final position, where the definition requires f=h1ghf=h^{-1}\circ g\circ h. Remark 2.11 also contains the unresolved locator '[21, ****]'. Both are fixed uniquely by the surrounding definition and bibliography and do not alter a theorem.

Theorems 5.4 and 5.7Correct

Near-maximal hyperbolicity is distinguished from strong positive recurrence

Section 5 · arXiv:2606.30939v1

The survey explicitly records that hyperbolicity of all nearly maximal-entropy measures does not by itself imply SPR, then adds the exponential-return-tail characterization under the stronger hypotheses. Thus the examples and implications do not collapse two inequivalent recurrence notions.

02Proofs2 reported findingsCorrect

The survey's proof sketches are correct at their announced level and cite complete sources for the underlying theorems.

Sections 3–6Correct and complete for a survey

Exponent continuity, coding, and return-tail mechanisms are accurately linked

Pages 6–18 · Sections 3–6 · arXiv:2606.30939v1

The implication from exponent continuity to a common Pesin block uses the correct contrapositive compactness argument. The homoclinic-class coding is invoked with finite-to-one recurrence properties, and exponential return tails are transferred through the SPR Markov model before statistical consequences are stated.

Sections 4–6Correct and complete for a survey

Symbolic coding and return-time arguments support the stated SPR consequences

Sections 4–6 · arXiv:2606.30939v1

The Markov extension is invoked on the hyperbolic Pesin blocks for which finite-to-one coding is available. Exponential return tails then give tightness and continuity of nearly maximal measures, while the counterexamples are placed outside the hypotheses. All proof sketches identify the cited results used for the omitted technical steps.

03Novelty0 reported findingsNo non-novelty findings

No non-novelty findings.

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Paper
arXiv:2606.30939v1
Authors listed
Jérôme Buzzi
Audit date
August 18, 2026
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