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2212.12202

A Parameter ASIP for the Quadratic Family

Magnus Aspenberg, Viviane Baladi, Tomas Persson

correctmedium confidence
Category
Not specified
Journal tier
Specialist/Solid
Processed
Sep 28, 2025, 12:56 AM

Audit review

The paper proves an ASIP for the parameter process near a transversal Misiurewicz parameter by (i) constructing a positive-measure Cantor set Ω* via a polynomial Benedicks–Carleson exclusion with precise distortion/comparability bounds (Proposition 2.2; Lemma 2.4, incl. the new (2.31)) and (ii) transferring uniform exponential decorrelation and fractional response from phase to parameter space, then executing a block–martingale–Skorokhod scheme to obtain error exponents γ>2/5 (Theorem 1.1; Section 4) . The candidate outline matches the high-level scaffolding but incorrectly asserts uniform L^p bounds for block-level martingale differences and invokes a reverse-martingale strong invariance principle without verifying its hypotheses; in the paper, fourth moments of the block martingale terms grow like j^{4/3+ι} and are handled via tailored LLN and Skorokhod time-change, not by a uniform-moment ASIP for reverse MDs (see (4.20), (4.25)–(4.31)) .

Referee report (LaTeX)

\textbf{Recommendation:} minor revisions

\textbf{Journal Tier:} specialist/solid

\textbf{Justification:}

This work establishes a parameter ASIP for the quadratic family with explicit error exponents, leveraging a carefully constructed positive-measure parameter Cantor set, new distortion control, and a Skorokhod-embedded martingale approach. The arguments are technically solid and improve the methodology for parameter-level limit theorems in unimodal dynamics. Minor clarifications and organisational tweaks would further enhance readability.