arXiv:2606.30998v1

Distributional results for the shortest distance between trajectories of different dynamics

Romain Aimino, Théophile Caby, Jorge Milhazes Freitas, Duarte Sá Pinho

math.DSmath.PR37A2537A5037B2037C3060G70

Abstract

We establish Extreme Value Distributions for the closest encounter between trajectories generated by different maps defined in the same reference phase space. For a class of strongly mixing maps, we show that the limit distribution depends on the length of the different trajectories and the co-dimension of the associated invariant measures. It is also modulated by an Extremal Index, that informs on the tendency of nearby points to diverge along with the evolution of their respective dynamics, serving as an indicator of their compatibility. We give a formula for this quantity for a class of chaotic maps of the interval and for the co-dimension in the case when the respective measures admit densities with isolated zeros and singularities. We present diverse examples of systems satisfying these assumptions and compute the different parameters modulating the limit distribution.

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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.

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Generated August 18, 2026
01Statements2 reported findingsCorrect

The extreme-value law for shortest simultaneous distances between trajectories of different expanding dynamics, its extremal-index criteria, and the linear and perturbed-map examples are correct under the stated transfer-operator hypotheses.

Theorem 4.1 and Sections 5–7Correct

Co-dimension and clustering give the announced limit law

Pages 8–9 and 13–27 · Theorem 4.1 and Sections 5–7 · arXiv:2606.30998v1

The shrinking diagonal tube has mass on the scale prescribed by the co-dimension. Perturbing the product transfer operator by killing that tube meets the Keller–Liverani assumptions on the quasi-Hölder space, and the return coefficients in equation (4.4) give the extremal index θ=1k0pk\theta=1-\sum_{k\geq0}p_k. Transverse intersections of incompatible factor maps force all pkp_k to vanish, whereas shared branches produce the explicitly computed clustered contribution.

Full paper, version 1
Sections 5–7Correct

Extremal indices for linear and perturbed pairs match the abstract theorem

Pages 18–34 · arXiv:2606.30998v1

When short returns of the shrinking diagonal are absent, the extremal index is one; periodic or resonant intersections produce the displayed cluster correction. The linear examples compute these intersections explicitly, and the perturbative hypotheses keep their boundaries transverse so the same limits persist.

02Proofs2 reported findingsCorrect

The spectral perturbation, shrinking-target geometry, extremal-index, and application proofs are correct and complete.

Sections 4–7Correct and complete

The rare-event operator estimates are uniform in the target scale

Pages 8–27 · Sections 4–7 · arXiv:2606.30998v1

Indicators of the diagonal tubes have uniformly controlled quasi-Hölder seminorm, the Lasota–Yorke estimate persists for the killed operators, and the weak-norm perturbation is proportional to tube mass. Transversality localizes repeated hits to finitely many branches, permitting dominated passage to the pkp_k limits. The explicit linear examples use the same Jacobian normalization as the abstract theorem.

Theorem 4.1 and applicationsCorrect and complete

Spectral perturbation and shrinking-target geometry satisfy the abstract rare-event hypotheses

Sections 4–7 · arXiv:2606.30998v1

Lasota–Yorke bounds give a uniform spectral gap for the punctured operators, while boundary regularity controls the norm of the hole perturbation. The overlap ratios determine clustering, all longer returns are summably negligible, and the application sections verify these properties for each announced dynamical pair.

03Novelty0 reported findingsNo non-novelty findings

No non-novelty findings.

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Paper
arXiv:2606.30998v1
Authors listed
Romain Aimino, Théophile Caby, Jorge Milhazes Freitas, Duarte Sá Pinho
Audit date
August 18, 2026
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