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2111.06055

STRONGLY DISTRIBUTIONAL CHAOS OF IRREGULAR ORBITS THAT ARE NOT UNIFORMLY HYPERBOLIC

Xiaobo Hou, Xueting Tian

correctmedium confidence
Category
math.DS
Journal tier
Strong Field
Processed
Sep 28, 2025, 12:56 AM

Audit review

The paper establishes the result via an abstract, verifiable framework (nested transitive locally maximal hyperbolic sets with exponential shadowing/expansiveness) and a precise α-DC1 construction that is uniform in t, culminating in Theorems A, E, and F. The candidate solution sketches a different, plausible program (finite gluing via λ-lemma and two periodic ‘building blocks’), but it has at least two critical gaps: (1) its α-DC1 limsup estimate depends on a fixed t in the stage-size choice and does not provide a uniform (all t > 0) argument required by the definition; (2) it relies on visits to arbitrarily small stable/unstable angles inside a non-uniformly hyperbolic homoclinic class/support without justification (this need not hold absent genericity). It also assumes uniformly bounded heteroclinic transition times inside S_μ that are not established. Consequently, the paper’s argument is correct and complete within its framework, whereas the model’s proof is incomplete.

Referee report (LaTeX)

\textbf{Recommendation:} minor revisions

\textbf{Journal Tier:} strong field

\textbf{Justification:}

The paper addresses a timely question in smooth dynamics: the prevalence of strong forms of distributional chaos within non-uniformly hyperbolic contexts. It develops a general abstract framework (exponential shadowing on nested hyperbolic subsystems) and applies it to homoclinic classes and supports of hyperbolic ergodic measures. The results strengthen prior DC1 statements to a uniform α-DC1 form and encompass rich fractal sets (irregular sets, level sets, and refined recurrence classes). The arguments are technically sound; suggested changes are mainly expository.