Pencils on Surfaces with Normal Crossings and the Kodaira Dimension of Mg,n

Pencils on Surfaces with Normal Crossings and the Kodaira Dimension of Mg,n
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具有法向交叉的曲面上的铅笔和 Mg,n 的 Kodaira 维数

DOI:
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发表时间:
2021
期刊:
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影响因子:
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通讯作者:
Ignacio Barros
Ignacio Barros
中科院分区:
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文献类型:
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作者:
Daniele Agostini;Ignacio Barros

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我们研究了具有法向交叉的曲面上曲线束的平滑。结果表明,M6,=的正则因子在一定范围内不是伪有效的,这意味着M12,6,M12,7,M13,4和M14,3是单圆的.我们提供了M12,8和M16的科代拉维数的上界。我们还证明了(46 + 5)点超椭圆曲线H6,46+5的模空间是单圆的.结合施瓦茨最近的一个结果,给出了具有负科代拉维数的尖超椭圆曲线的模的分类.
We study smoothing of pencils of curves on surfaces with normal crossings. As a consequence we show that the canonical divisor of M6,= is not pseudoeffective in some range, implying that M12,6, M12,7, M13,4 and M14,3 are uniruled. We provide upper bounds for the Kodaira dimension of M12,8 and M16. We also show that the moduli space of (46 + 5)-pointed hyperelliptic curves H6,46+5 is uniruled. Together with a recent result of Schwarz, this concludes the classification of moduli of pointed hyperelliptic curves with negative Kodaira dimension.
DOI: 10.1007/978-3-540-85420-3
发表时间: 2009-02
期刊: --
影响因子: --
作者:
J. Lipman;M. Hashimoto
通讯作者: J. Lipman;M. Hashimoto