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arXiv math/9912041math.AG
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Sextics中的椭圆曲线

Elliptic Curves from Sextics

Mutsuo Oka

摘要:

设$\mathcal N$是具有3(3,4)-尖点的六次曲线的模空间.商模空间${\mathcal N}/G$是一维的,并且由两个分量${\mathcal N}_{torus}/G$和${\mathcal N}_{gen}/G$组成。通过二次变换,分别将它们变换为单参数三次曲线族$C_s$和$D_s$。分别研究了三次曲线$C_s$ over $\bfQ$和$D_s$ over $\bfQ(\sqrt{-3})$的Mordell-Weil扭群.我们证明了$C_{s}$具有一般$s\in \bf Q$的扭群$\bf Z/3\bf Z$,并且它还包含与Kubert给出的具有扭群$\bf Z/6\bf Z$,$\bf Z/6\bf Z+\bf Z/2\bf Z$,$\bf Z/9\bf Z$或$\bf Z/12\bf Z$的泛族一致的子族.三次曲线$D_s$一般具有挠率$\bf Z/3\bf Z+\bf Z/3\bf Z$,但对于由$ \bf Q(\sqrt{-3}) $参数化的子族也具有挠率$\bf Z/3\bf Z+\bf Z/6\bf Z$。

英文摘要:

Let $\mathcal N$ be the moduli space of sextics with 3 (3,4)-cusps. The quotient moduli space ${\mathcal N}/G$ is one-dimensional and consists of two components, ${\mathcal N}_{torus}/G$ and ${\mathcal N}_{gen}/G$. By quadratic transformations, they are transformed into one-parameter families $C_s$ and $D_s$ of cubic curves respectively. We study the Mordell-Weil torsion groups of cubic curves $C_s$ over $\bfQ$ and $D_s$ over $\bfQ(\sqrt{-3})$ respectively. We show that $C_{s}$ has the torsion group $\bf Z/3\bf Z$ for a generic $s\in \bf Q$ and it also contains subfamilies which coincide with the universal families given by Kubert with the torsion groups $\bf Z/6\bf Z$, $\bf Z/6\bf Z+\bf Z/2\bf Z$, $\bf Z/9\bf Z$ or $\bf Z/12\bf Z$. The cubic curves $D_s$ has torsion $\bf Z/3\bf Z+\bf Z/3\bf Z$ generically but also $\bf Z/3\bf Z+\bf Z/6\bf Z$ for a subfamily which is parametrized by $ \bf Q(\sqrt{-3}) $.

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