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arXiv 1306.5284math.AG
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具(2,4,4)-分裂Jacobian的亏格3超椭圆曲线

Genus 3 hyperelliptic curves with (2, 4, 4)-split Jacobians

T. Shaska

摘要:

研究了定义在$\mathbb C$上亏格为3的超椭圆曲线的2次和4次椭圆子覆盖.亏格为3的超椭圆曲线族是超椭圆模$\mathcal H_3$的一个二维子变种,它对椭圆曲线$E$有2次覆盖,对椭圆曲线$E_1$和$E_2$有4次覆盖。我们明确地确定这个子变种。对于任何给定的模点$\mathfrak p \in \mathcal H_3$,我们明确地确定相应的亏格3曲线$\mathcal X$是否属于这样的家庭。当它这样做时,我们可以确定椭圆子覆盖$E$,$E_1$和$E_2$在绝对不变量$t_1, \dots, t_6$的\cite{hyp_mod_3}。该簇提供了一个新的亏格为3的超椭圆曲线族,其中Jacobian完全分裂。当$E_1$同构于$E_2$时,该族的子轨迹是我们明确确定的一维簇.我们还可以从$E_1$的$j$ -不变量开始确定$\mathcal X$和$E$。

英文摘要:

We study degree 2 and 4 elliptic subcovers of hyperelliptic curves of genus 3 defined over $\mathbb C$. The family of genus 3 hyperelliptic curves which have a degree 2 cover to an elliptic curve $E$ and degree 4 covers to elliptic curves $E_1$ and $E_2$ is a 2-dimensional subvariety of the hyperelliptic moduli $\mathcal H_3$. We determine this subvariety explicitly. For any given moduli point $\mathfrak p \in \mathcal H_3$ we determine explicitly if the corresponding genus 3 curve $\mathcal X$ belongs or not to such family. When it does, we can determine elliptic subcovers $E$, $E_1$, and $E_2$ in terms of the absolute invariants $t_1, \dots, t_6$ as in \cite{hyp_mod_3}. This variety provides a new family of hyperelliptic curves of genus 3 for which the Jacobians completely split. The sublocus of such family when $E_1$ is isomorphic to $E_2$ is a 1-dimensional variety which we determine explicitly. We can also determine $\mathcal X$ and $E$ starting form the $j$-invariant of $E_1$.

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