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arXiv 1807.08413math.AG
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亏格为4的稳定对数曲面、容许覆盖和标准曲线

Stable log surfaces, admissible covers, and canonical curves of genus 4

Anand Deopurkar, Changho Han

摘要:

我们明确地描述了KSBA/Hacking紧的模空间的Picard秩2的日志表面。空间参数化对数对$(S, D)$,其中$S$是$\mathbb{P}^1 \times \mathbb{P}^1$的退化,而$D \subset S$是$(3,3)$类曲线的退化。证明了紧化的模空间是一个具有4个边界分支的光滑Deligne-Mumford栈。我们把它与亏格为4的曲线的模空间,我们表明,它紧的超椭圆轨迹的爆破。我们还将它与$\mathbb{P}^1$的三重覆盖的Hurwitz空间的亏格为4的曲线的紧化联系起来。

英文摘要:

We explicitly describe the KSBA/Hacking compactification of a moduli space of log surfaces of Picard rank 2. The space parametrizes log pairs $(S, D)$ where $S$ is a degeneration of $\mathbb{P}^1 \times \mathbb{P}^1$ and $D \subset S$ is a degeneration of a curve of class $(3,3)$. We prove that the compactified moduli space is a smooth Deligne--Mumford stack with 4 boundary components. We relate it to the moduli space of genus 4 curves; we show that it compactifies the blow-up of the hyperelliptic locus. We also relate it to a compactification of the Hurwitz space of triple coverings of $\mathbb{P}^1$ by genus 4 curves.

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