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arXiv 2211.04073math.AG
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非理想域上正则亏格一曲线的结构

The structure of regular genus-one curves over imperfect fields

Stefan Schröer

摘要:

在不完美域上,我们给出了正则但非几何正则的亏格曲线的一个综合分类,推广了已知的几何约化的曲线的情形。描述是内在的,在扭曲形式的标准模型方面的无穷小群计划的行动,而不是通过外在方程。主要的新思想是分析和利用科恩结构定理中的代表域的模。这些结果有助于理解高维基底上的单格纤维化。

英文摘要:

Working over imperfect fields, we give a comprehensive classification of genus-one curves that are regular but not geometrically regular, extending the known case of geometrically reduced curves. The description is given intrinsically, in terms of twisted forms of standard models with respect to infinitesimal group scheme actions, and not via extrinsic equations. The main new idea is to analyze and exploit moduli for fields of representatives in Cohen's Structure Theorem. The results serve for the understanding of genus-one fibrations over higher-dimensional bases.

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