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arXiv 1102.4184math.AG
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非正规阿贝尔覆盖

Non-normal abelian covers

Valery Alexeev, Rita Pardini

摘要:

阿贝尔覆盖是簇的有限态射$X\to Y$,它是有限阿贝尔群$G$的一般忠实作用的商映射。在\cite{Pardini_AbelianCovers}中研究了具有$Y$ smooth和$X$ normal的阿贝尔覆盖。在这里,我们研究非正常的情况下,假设$X$和$Y$是$S_2$品种,在最坏的正规交叉外的一个子集的余维$\ge 2$。特别注意的情况下,$\Z_2^r$ -覆盖的表面,这是用于arxiv:0901.4431明确构造紧化的一些组件的模空间的一般类型的表面。

英文摘要:

An abelian cover is a finite morphism $X\to Y$ of varieties which is the quotient map for a generically faithful action of a finite abelian group $G$. Abelian covers with $Y$ smooth and $X$ normal were studied in \cite{Pardini_AbelianCovers}. Here we study the non-normal case, assuming that $X$ and $Y$ are $S_2$ varieties that have at worst normal crossings outside a subset of codimension $\ge 2$. Special attention is paid to the case of $\Z_2^r$-covers of surfaces, which is used in arxiv:0901.4431 to construct explicitly compactifications of some components of the moduli space of surfaces of general type.

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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