Some cases of Oort's conjecture about Newton polygons

This paper contains a method to prove the existence of smooth curves in positive characteristic whose Jacobians have unusual Newton polygon. Using this method, I give a new proof that there exist supersingular curves of genus $4$ for every prime $p$. More generally, for every prime $p$ and every $g...

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Bibliographic Details
Main Author Pries, Rachel
Format Journal Article
LanguageEnglish
Published 19.06.2023
Subjects
Mathematics - Algebraic Geometry
Mathematics - Number Theory
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Summary:This paper contains a method to prove the existence of smooth curves in positive characteristic whose Jacobians have unusual Newton polygon. Using this method, I give a new proof that there exist supersingular curves of genus $4$ for every prime $p$. More generally, for every prime $p$ and every $g \geq 4$, I prove that every Newton polygon whose $p$-rank is at least $g-4$ occurs for a smooth curve of genus $g$. In addition, I resolve some cases of Oort's conjecture about Newton polygons.
DOI:10.48550/arxiv.2306.11080