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arXiv 0801.1288math.AG
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加权点曲线的GIT稳定性

GIT stability of weighted pointed curves

David Swinarski

摘要:

在这里,我给出了一个直接的证明,平滑曲线与不同的标志点是渐近Hilbert稳定的参数空间和线性化的范围很广。这一结果可用于构造Deligne-Mumford稳定点曲线\bar M_g,n的粗模空间和加权点曲线\bar M_g,A的Hassett模空间(虽然本文没有给出模空间的全部构造,只给出了稳定性证明).我的证明遵循Gieseker的方法,将GIT问题简化为组合问题,尽管解决方案非常不同。任何1-PS λ在P^N中的曲线C上的作用都产生了H^0(C,O(1))和H^0(C,O(m))的加权过滤,我给出了一个关于这些过滤阶段的基轨迹的组合学的方法,以表明C相对于λ是稳定的。

英文摘要:

Here I give a direct proof that smooth curves with distinct marked points are asymptotically Hilbert stable with respect to a wide range of parameter spaces and linearizations. This result can be used to construct the coarse moduli space of Deligne-Mumford stable pointed curves \bar M_g,n and Hassett's moduli spaces of weighted pointed curves \bar M_g,A (though the full construction of the moduli spaces is not contained in this paper, only the stability proof). My proof follows Gieseker's approach to reduce to the GIT problem to a combinatorial problem, though the solution is very different. The action of any 1-PS lambda on a curve C in P^N gives rise to weighted filtrations of H^0 (C, O(1)) and H^0 (C, O(m)), and I give a recipe in terms of the combinatorics of the base loci of the stages of these filtrations for showing that C is stable with respect to lambda.

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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