Non-existence of separating morphisms of low degree

Aloïs Demory; Gurvan Mével; Antoine Toussaint

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arXiv · 2608.26927

Non-existence of separating morphisms of low degree

Aloïs Demory·Gurvan Mével·Antoine Toussaint

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Abstract

A separating curve is a real curve whose real part disconnects its complex part. It also admits totally real morphisms to the projective line, and the separating gonality is the minimal possible degree for such morphisms. The separating gonality is bounded from below by the number of connected components of the real part of the curve. In this paper, we build on a strategy of Manzaroli to improve this lower bound for some curves embedded in the projective plane or in a Hirzebruch surface.

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Aloïs Demory, Gurvan Mével, Antoine Toussaint. 2026-08-27. Non-existence of separating morphisms of low degree. https://arxiv.org/abs/2608.26927

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