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arXiv math/0611813math.AG
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尖超椭圆曲线模空间点的等变计数

Equivariant counts of points of the moduli spaces of pointed hyperelliptic curves

Jonas Bergström

摘要:

研究亏格为$g$的$n$点光滑超椭圆曲线的模空间$\Hh_{g,n}$.为了得到上同调的信息,我们希望使$\s_n$ -等变计数的点的数量定义在模空间的有限域。我们发现递归关系的属,这些号码履行。因此,如果我们可以对低亏格进行$\Hh_{g,n}$的$\s_n$ -等变计数,那么我们可以对每个亏格都这样做。然后发现关于亏格0和1的曲线的信息足以计算所有$g$和$n \leq 7$的$\Hh_{g,n}$的答案。这些结果被应用到亏格为2的稳定曲线的模空间中,得到了$\s_n$ -等变Galois(分别为. Hodge)结构的$\ell$ -adic(resp. Betti)上同调。

英文摘要:

We consider the moduli space $\Hh_{g,n}$ of $n$-pointed smooth hyperelliptic curves of genus $g$. In order to get cohomological information we wish to make $\s_n$-equivariant counts of the numbers of points defined over finite fields of this moduli space. We find recurrence relations in the genus that these numbers fulfill. Thus, if we can make $\s_n$-equivariant counts of $\Hh_{g,n}$ for low genus, then we can do this for every genus. Information about curves of genus 0 and 1 is then found to be sufficient to compute the answers for $\Hh_{g,n}$ for all $g$ and for $n \leq 7$. These results are applied to the moduli spaces of stable curves of genus 2 with up to 7 points, and this gives us the $\s_n$-equivariant Galois (resp. Hodge) structure of their $\ell$-adic (resp. Betti) cohomology.

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