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2109.00469

Entropy of Lyapunov Maximizing Measures of GL(2,R) Typical Cocycles

Reza Mohammadpour

incompletehigh confidence
Category
math.DS
Journal tier
Specialist/Solid
Processed
Sep 28, 2025, 12:56 AM

Audit review

The paper’s main claim (Theorem 1.2) matches the candidate solution’s conclusion: under 1-pinching, 1-twisting, and the NOC on the Mather set K, every Lyapunov maximizing measure has zero entropy . However, the paper reduces to a subshift setting and then asserts that Bochi–Rams’ argument extends, providing only partial details and stating that “the rest of the proof … will work … up to some minor modifications,” which is insufficient as written . By contrast, the candidate solution gives a coherent cone-contraction/Hilbert-metric proof sketch that directly yields zero entropy from forward cone invariance plus forward NOC, with pinching/twisting used only earlier to guarantee domination/NOC on K, consistent with the paper’s setup (domination ⇔ invariant multicone; definition of NOC) .

Referee report (LaTeX)

\textbf{Recommendation:} major revisions

\textbf{Journal Tier:} specialist/solid

\textbf{Justification:}

The manuscript pursues a natural extension: zero entropy of Lyapunov-maximizing measures for typical 2D one-step cocycles under NOC on the Mather set. The overall framework (domination ↔ invariant multicones; extremal norms; subshift reductions) is sound and the result is plausible. However, the proof is incomplete as written: the SFT reduction, preservation of NOC, and the adaptation of Bochi–Rams are only sketched. Completing these components and improving exposition would elevate the paper to a solid, specialized contribution.