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Mathematics > Number Theory

arXiv:2505.11348 (math)
[Submitted on 16 May 2025 ]

Title: del Pezzo surfaces with one bad prime over cyclotomic $\mathbb{Z}_\ell$-extensions

Title: del Pezzo 曲面在分圆$\mathbb{Z}_\ell$扩张下的一个坏素数

Authors:Maryam Nowroozi
Abstract: Let $K$ be a number field and $S$ a finite set of primes of $K$. Scholl proved that there are only finitely many $K$-isomorphism classes of del Pezzo surfaces of any degree $1 \le d \le 9$ over $K$ with good reduction away from $S$. Let instead $K$ be the cyclotomic $\mathbb{Z}_5$-extension of $\mathbb{Q}$.In this paper, we show, for $d=3$, $4$, that there are infinitely many $\overline{\mathbb{Q}}$ isomorphism classes of del Pezzo surfaces, defined over $K$, with good reduction away from the unique prime above $5$.
Abstract: 设$K$为一个数域,$S$为$K$的有限素理想集。 Scholl 证明了对于任何度数$1 \le d \le 9$的 del Pezzo 曲面,在$K$上除了$S$以外具有良好约化的情况下,只有有限多个$K$-同构类。 设$K$为$\mathbb{Z}_5$分圆$\mathbb{Q}$扩张。在本文中,我们证明,对于$d=3$,$4$,存在无限多个$\overline{\mathbb{Q}}$同构类的 del Pezzo 曲面,定义在$K$上,在唯一的位于$5$上的素数以外具有良好约化。
Subjects: Number Theory (math.NT) ; Algebraic Geometry (math.AG)
MSC classes: 11G35 (14G05)
Cite as: arXiv:2505.11348 [math.NT]
  (or arXiv:2505.11348v1 [math.NT] for this version)
  https://doi.org/10.48550/arXiv.2505.11348
arXiv-issued DOI via DataCite

Submission history

From: Maryam Nowroozi [view email]
[v1] Fri, 16 May 2025 15:14:27 UTC (12 KB)
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