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arXiv 1302.6261math.NTmath.AG
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Hermite曲线的Ekedahl-Oort型Jacobian

The Ekedahl-Oort type of Jacobians of Hermitian curves

Rachel Pries, Colin Weir

摘要:

Ekedahl-Oort型是定义在特征为$p > 0$的代数闭域上的主极化阿贝尔簇$A$的组合不变量。刻画了$A$的$p$ -扭群概型直至同构.等价地,它将$p$的Dieudonne模或$A$的de Rham上同调刻画为Frobenius和Vershiebung算子下的模。关于曲线的雅可比行列式出现哪种Ekedahl-Oort型的结果很少。在本文中,我们考虑一类厄米曲线,指标的一个素数权力$q=p^n$,这是超奇异曲线众所周知,他们的特殊算术性质。我们确定了所有Hermitian曲线的Jacobian的Ekedahl-Oort型。一个有趣的特征是它们的不可分解因子由${\mathbb Z}/(2^n+1)$上乘2映射的轨道决定,因此不依赖于$p$。这产生了关于厄米特曲线的雅可比行列式分解到同构的应用。

英文摘要:

The Ekedahl-Oort type is a combinatorial invariant of a principally polarized abelian variety $A$ defined over an algebraically closed field of characteristic $p > 0$. It characterizes the $p$-torsion group scheme of $A$ up to isomorphism. Equivalently, it characterizes (the mod $p$ reduction of) the Dieudonné module of $A$ or the de Rham cohomology of $A$ as modules under the Frobenius and Vershiebung operators. There are very few results about which Ekedahl-Oort types occur for Jacobians of curves. In this paper, we consider the class of Hermitian curves, indexed by a prime power $q=p^n$, which are supersingular curves well-known for their exceptional arithmetic properties. We determine the Ekedahl-Oort types of the Jacobians of all Hermitian curves. An interesting feature is that their indecomposable factors are determined by the orbits of the multiplication-by-two map on ${\mathbb Z}/(2^n+1)$, and thus do not depend on $p$. This yields applications about the decomposition of the Jacobians of Hermitian curves up to isomorphism.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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