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2205.14062

Mall bundles and flat connections on Hopf manifolds

Liviu Ornea, Misha Verbitsky

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

Audit review

The paper proves Flat ⇒ Mall and, conversely, that any non‑resonant Mall bundle admits a unique compatible flat holomorphic connection (Theorem 5.15), using Mall’s cohomology theorem and a vanishing argument for curvature. The model gives an alternative, constructive proof: extend the γ-linearization across 0 by Hartogs, conjugate it to a constant via a uniformly convergent infinite product, and descend the trivial connection; uniqueness follows from H^0(H, Ω_H^1 ⊗ End B)=0. The model’s construction in fact suggests flat connections exist for all Mall bundles (not only non‑resonant), which goes beyond what the paper claims, but does not contradict it.

Referee report (LaTeX)

\textbf{Recommendation:} minor revisions

\textbf{Journal Tier:} specialist/solid

\textbf{Justification:}

The paper correctly proves that non‑resonant Mall bundles admit unique compatible flat connections and applies this to linearize non‑resonant contractions. The exposition is clear and technically sound. A constructive, fiberwise straightening argument (as in the model’s solution) could streamline the existence part and possibly broaden the scope beyond non‑resonance; adding this as a remark would enhance the paper.