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arXiv 1206.4535math.AG
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Hurwitz空间的紧化

Compactifications of Hurwitz spaces

Anand Deopurkar

摘要:

我们构造了亏格为$g$曲线的Hurwitz空间$H^d_{g/h}$的几个模紧化,表示为亏格为$h$曲线的$d$ -单支复盖.这些紧化是通过允许覆盖的分支点碰撞到一个可变的程度。如果是$d = 2, 3$,或者如果允许相对较少的冲突,则它们表现得非常好。作为特殊情况,我们恢复扭曲的可容许覆盖的Abramovich,Corti和Vistoli和空间的超椭圆曲线的Fedorchuk的空间。

英文摘要:

We construct several modular compactifications of the Hurwitz space $H^d_{g/h}$ of genus $g$ curves expressed as $d$-sheeted, simply branched covers of genus $h$ curves. These compactifications are obtained by allowing the branch points of the covers to collide to a variable extent. They are very well-behaved if $d = 2, 3$, or if relatively few collisions are allowed. We recover as special cases the spaces of twisted admissible covers of Abramovich, Corti and Vistoli and the spaces of hyperelliptic curves of Fedorchuk.

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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