arXiv:2607.29275v1

On the spectral analysis of dynamical Möbius-Sarnak process and topological entropy of Möbius fonction

el Houcein el Abdalaoui

math.DS37A3054H2047A3511N64

Abstract

By extending the Rokhlin-Sinai machinery relating to the entropy and countable Lebesgue component in the spectrum, we establish that the dynamical Möbius-Sarnak process has a countable Lebesgue component. Inspired by recent work of M. Lin and the author, we extend the notion of spectral measure to all operators on Banach spaces. This generalization is further motivated by the Bellow-Losert extension of Wiener's notion of the spectral measure of sequences. Furthermore, we establish unconditionally that the topological entropy of the Möbius flow is given by 6π2log3\frac{6}{π^2}\log 3. Among other consequences, we recover a recent result by el Abdalaoui-Nerurkar which asserts that for any quasi-generic measure for the Möbius function, the Möbius flow equipped with this measure has a countable Lebesgue component in its spectrum. It follows that the Sarnak Möbius orthogonality conjecture holds for any topological dynamical system with singular spectrum. We further show that all the potential spectral measures of he Möbius function are absolutely continuous with respect to Lebesgue measure.

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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
01Statements2 reported findingsContains unsupported statements

Two central conclusions are not established by the supplied arguments: the singular-spectrum transfer uses a Rokhlin–Sinai factor only modulo a different measure, and the entropy calculation concerns the full admissible ternary shift rather than the actual Möbius orbit closure.

Theorem 3.1Not able to verify

The singular-spectrum conclusion is not established for an arbitrary quasi-generic measure

Pages 7–8 · Theorem 3.1 and Proposition 3.3 · arXiv:2607.29275v1

The sub-sigma-algebra used in the proof is obtained for the distinguished measure ηM\eta_M. The theorem then applies its tail and conditional-expectation identities inside L2(η)L^2(\eta) for an arbitrary quasi-generic measure η\eta. Those identities hold only modulo ηM\eta_M, and η\eta may be singular to ηM\eta_M, so no transfer of the null sets or conditional expectations follows. This blocks the claimed exclusion of a Lebesgue spectral component and its downstream singular-spectrum conclusions.

Theorems 5.1 and 5.5Not able to verify

The entropy of the actual Möbius orbit closure is not derived

Pages 11–14 · Theorems 5.1 and 5.5 · arXiv:2607.29275v1

The proof counts words in the full admissible ternary subshift. It does not prove that every such signed admissible block occurs in the Möbius sequence, or otherwise identify the actual Möbius orbit closure with that larger shift. The entropy of the larger model therefore supplies no matching lower bound for the orbit closure appearing in the theorem.

02Proofs2 reported findingsContains incorrect or incomplete proofs

The measure-transfer step and the orbit-closure identification are missing substantive arguments. In addition, the displayed word count omits the sign multiplicity of each support.

Proof of Theorem 3.1Incorrect as written

Null-set and conditional-expectation identities are moved between unrelated measures

Pages 7–8 · proof of Theorem 3.1 · arXiv:2607.29275v1

A Rokhlin–Sinai sub-sigma-algebra is a measure-algebra object. Constructing it for ηM\eta_M does not make its generating-tail identity valid modulo an arbitrary η\eta, nor does it identify conditional expectations taken with respect to η\eta and ηM\eta_M. No absolute-continuity hypothesis is present. No repair is supplied, and every later use of Proposition 3.3 that relies on this transfer remains unsupported.

Proof of Theorem 5.1Incorrect as written

The finite-word count omits sign choices

Page 12 · Equation (5.5) · arXiv:2607.29275v1

Words are grouped by their nonzero support AA, but a support of size A|A| admits 2A2^{|A|} independent sign assignments. The displayed count treats the support as if it determined the word. Adding that factor repairs this local count, but it does not repair the separate missing identification of the full admissible shift with the Möbius orbit closure.

03Novelty0 reported findingsNo non-novelty findings

No non-novelty findings.

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Paper
arXiv:2607.29275v1
Authors listed
el Houcein el Abdalaoui
Audit date
August 18, 2026
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