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2207.13608

Distribution of periodic orbits in the homology group of a knot complement

Solly Coles, Richard Sharp

correcthigh confidence
Category
Not specified
Journal tier
Strong Field
Processed
Sep 28, 2025, 12:56 AM

Audit review

The paper proves precise window asymptotics for linking numbers and full homology in a knot complement for transitive Anosov flows via a symbolic suspension, a locally constant Z^{b+N}-valued cocycle, Legendre duality for pressure, and a direct application of Babillot–Ledrappier’s constrained-orbit theorem. The candidate gives a parallel route: build Hölder cocycles by integrating closed 1-forms (ambient homology and meridians), invoke Ruelle–Parry–Pollicott spectral perturbation, and obtain the same T^{−1−d/2}e^{h(ρ)T} law. The main asymptotic shape, analyticity/positivity of the entropy function, and the reductions agree with the paper. Two caveats for the candidate: (i) they do not explicitly verify the key group hypotheses (AF=Z^d and ÃF=R×AF) that the paper establishes; and (ii) they claim the prefactor c_{ρ,·}(T) can be made constant under the non-arithmetic (not locally constant) roof, whereas the paper retains a bounded positive T-dependent factor (arising, e.g., from the e^{⟨u(ρ), Tρ−⌊Tρ⌋⟩} term). These are minor fixable points; the core argument and conclusions match the paper’s results.

Referee report (LaTeX)

\textbf{Recommendation:} minor revisions

\textbf{Journal Tier:} strong field

\textbf{Justification:}

The work delivers sharp window asymptotics for the distribution of periodic orbits in knot-complement homology, extending classical homology-class counting. The reduction to symbolic dynamics with a locally constant cocycle and the deployment of Babillot–Ledrappier’s theorem, together with a careful verification of the structural subgroup assumptions, make the proofs robust. Exposition is clear; only small clarifications are suggested.