2407.03287
Generic complex polynomial vector fields with real coefficients
Jonathan Godin, Christiane Rousseau
correctmedium confidence
- Category
- Not specified
- Journal tier
- Specialist/Solid
- Processed
- Sep 28, 2025, 12:56 AM
- arXiv Links
- Abstract ↗PDF ↗
Audit review
The paper’s Theorem 7.4 states precisely the realization and parametrization of generic real polynomial vector fields of degree k+1 by a modulus (τ, η), with τ a non-crossing involution satisfying the real-symmetry constraints and η living in H^{(k−m+1)/2 − ℓ} × (iR+)^{m−1+ℓ} × (R+)^{ℓ}, together with uniqueness of the monic centered realizing polynomial and the counts of m real singular points and ℓ homoclinic loop(s) along R. The proof proceeds by gluing horizontal strips in rectifying time, uniformizing the resulting surface, and imposing an antiholomorphic involution to ensure real coefficients; this matches the candidate’s Douady–Sentenac/Branner–Dias strip-model approach and reality constraints. Key ingredients in the paper include the analytic invariant for complex-generic vector fields via horizontal strip heights and uniqueness (DES/BD), the real-form combinatorics, the count of real-symmetric strips and pairs, and the existence/uniqueness realization in the real case via a conjugation on the glued surface leading to a monic polynomial of degree k+1 with real coefficients. The only minor difference is expository: the paper describes the glued surface as a sphere with k+1 punctures before push-forward, whereas the candidate speaks of a simply connected parabolic surface; these are compatible viewpoints of the same uniformization step and do not affect correctness. See Theorem 7.4 and its proof outline, the combinatorial/analytic invariant setup, and the gluing and conjugation construction in the paper .
Referee report (LaTeX)
\textbf{Recommendation:} minor revisions \textbf{Journal Tier:} specialist/solid \textbf{Justification:} A careful and coherent adaptation of the Douady–Estrada–Sentenac/Branner–Dias framework to polynomial vector fields with real coefficients. The main theorem gives an exact, dimensionally correct parametrization of generic strata and a realization/uniqueness result. The construction via strip gluing and the introduction of an antiholomorphic involution are standard but are executed cleanly. Minor clarifications (normalization choices and the uniformization viewpoint) would improve readability.