arXiv:2405.17045v2

A cohomological approach to Ruelle-Pollicott resonances and speed of mixing of Anosov diffeomorphisms

Daniele Galli

math.DSmath.DG37A2537D2037C3014F40

Abstract

We investigate Ruelle-Pollicott resonances of smooth Anosov diffeomorphisms, acting on manifolds of every dimension, with respect to the measure of maximal entropy. We highlight a profound connection between resonances and eigenvalues of the action induced by the dynamics on de Rham cohomology. In particular, resonances appear as eigenvalues of a quasi-compact transfer operator acting on suitable anisotropic spaces of currents. After defining the anisotropic Banach spaces, we introduce the anisotropic de Rham cohomology and we show that it is isomorphic to the standard de Rham cohomology. The relation between resonances and cohomological eigenvalues is deduced from a comparison of spectra. We finally exploit these results to get information about the Ruelle-Pollicott asymptotics of the correlation function and to establish a cohomological bound for the speed of mixing of Anosov diffeomorphisms.

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Audited against arXiv v2

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.

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Generated August 18, 2026
01Statements3 reported findingsCorrect

The cohomological description of the large Ruelle–Pollicott resonances, the resulting correlation bound, and the toral specialization are correct. One limit in the entropy verification is printed with the wrong endpoint and is an unambiguous typo.

Theorem 2.1 and Corollary 2.2Correct

Resonances outside the essential spectral radius are identified cohomologically

Pages 6–8 and Sections 3–6 · Theorem 2.1 and Corollary 2.2 · arXiv:2405.17045v2

The pushforward is quasi-compact on the anisotropic current spaces with essential radius bounded by the announced hyperbolicity factor. The anisotropic de Rham complex has the same cohomology as the smooth complex, and the spectral comparison identifies every eigenvalue above the essential radius, including Jordan multiplicities. Pairing the resulting decomposition with smooth observables yields the correlation expansion and the stated speed-of-mixing bound.

Corollary 2.3Correct

The toral cohomology spectrum gives the stronger mixing estimate

Pages 7–8 and Section 6 · torus specialization · arXiv:2405.17045v2

For a diffeomorphism topologically conjugate to a hyperbolic toral automorphism, the induced cohomology action is the corresponding exterior-power action. Its non-leading eigenvalues lie below the threshold used in Theorem 2.1, so no additional resonance contributes in the indicated annulus and the displayed exponential bound follows.

Lemma 4.12Typo

The local-entropy limit should be taken as the radius tends to zero

Page 32 · proof that the constructed measure has maximal entropy · arXiv:2405.17045v2

The displayed local-entropy formula writes the outer limit as ε+\varepsilon\to+\infty. For dynamical balls and the cited local entropy theorem, it must be ε0\varepsilon\to0. Lemma 4.11 supplies bounds for small radii and the immediately following inference uses that regime, so the correction is uniquely determined and does not affect the proof or the result.

02Proofs1 reported findingCorrect

The anisotropic-space construction, quasi-compactness, maximal-entropy measure construction, anisotropic de Rham comparison, and final spectral expansion are complete. The reported entropy-limit endpoint is only a typo.

Sections 3–6Correct and complete

The functional-analytic and cohomological proof closes at the stated spectral threshold

Anisotropic currents through proof of Theorem 2.1 · arXiv:2405.17045v2

The Lasota–Yorke and compact-inclusion estimates establish quasi-compactness; positivity and Bowen-ball estimates identify the leading eigenmeasure with the Bowen–Margulis measure. The local Poincaré lemma and Čech zigzag prove the cohomology isomorphism with compatible dynamics. The spectral comparison is then applied only outside the established essential radius, which is exactly the range asserted in the main theorem.

03Novelty0 reported findingsNo non-novelty findings

No non-novelty findings.

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Paper
arXiv:2405.17045v2
Authors listed
Daniele Galli
Audit date
August 18, 2026
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