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arXiv 1402.3498math.NT
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非分裂Cartan模曲线的模解释

A moduli interpretation for the non-split Cartan modular curve

Marusia Rebolledo, Christian Wuthrich

摘要:

模曲线如X_0(N)、X_1(N)等在算术几何中经常出现。虽然它们的复点是通过SL_2(Z)的某些子群的上半平面的商得到的,但它们允许作为模问题的解的更多算术描述。这种描述在许多应用中非常有用。我们希望给出GL_2(F_p)中两条模曲线的模描述:与非分裂Cartan子群相关的模曲线及其正规化子.这些模曲线出现,例如在塞尔的问题分类所有可能的伽罗瓦结构的p-扭点的椭圆曲线在一些领域。一些经典的结果,这些曲线的几何可以证明使用这种模描述。例如,我们可以计算椭圆点的个数,描述尖点和退化映射。我们还对Chen的一个结果给出了模论的解释和新的证明。

英文摘要:

Modular curves like X_0(N) and X_1(N) appear very frequently in arithmetic geometry. While their complex points are obtained as a quotient of the upper half plane by some subgroups of SL_2(Z), they allow for a more arithmetic description as a solution to a moduli problem. This description turns out to be very useful in many applications. We wish to give such a moduli description for two modular curves: those associated to non-split Cartan subgroups and their normaliser in GL_2(F_p). These modular curves appear for instance in Serre's problem of classifying all possible Galois structures of p-torsion points on elliptic curves over number fields. Some classical results about the geometry of those curves can be proven using this moduli description. For instance, we can count the number of elliptic points, describe the cusps and the degeneracy maps. We also give a moduli-theoretic interpretation and a new proof of a result of Chen.

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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