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arXiv 1302.4804math.AG
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亏格五正则曲线的稳定性

Stability of genus five canonical curves

Maksym Fedorchuk, David Ishii Smyth

摘要:

我们分析了$\mathbb{P}^4$中二次曲面网的GIT稳定性,直到射影等价。由于一般的二次曲面网定义了亏格为5的正则嵌入平滑曲线,因此得到的GIT商给出了亏格为5的曲线的模空间的双有理模型。我们研究了相应的压缩几何,证明了构造的GIT商是亏格为5的曲线的模空间的对数极小模型程序的最后一步。

英文摘要:

We analyze GIT stability of nets of quadrics in $\mathbb{P}^4$ up to projective equivalence. Since a general net of quadrics defines a canonically embedded smooth curve of genus five, the resulting GIT quotient gives a birational model of the moduli space of genus 5 curves. We study the geometry of the associated contraction and prove that the constructed GIT quotient is the final step of the log minimal model program for the moduli space of genus 5 curves.

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