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arXiv 1306.6580math.AG
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加权尖曲线模空间中的重言式关系

Tautological relations in moduli spaces of weighted pointed curves

Felix Janda

摘要:

Pandharipande-Pixton利用稳定亏格的模空间的几何关系,在光滑亏格g曲线的模空间$M_g$上建立重言式Chow类之间的关系。我们研究了一个自然扩张,他们的方法的边界和更一般的Hassett的模空间$\overline M_{g, w}$稳定的节点曲线加权标记点。对这些关系的代数操作将它们带入Faber-Zagier类型的形式。我们表明,他们给Pixton的广义FZ关系时,所有的权重是一个。作为特殊情况,我们给出了$M_g$上泛曲线的n重积的FZ关系的一个公式。

英文摘要:

Pandharipande-Pixton have used the geometry of the moduli space of stable quotients to produce relations between tautological Chow classes on the moduli space $M_g$ of smooth genus g curves. We study a natural extension of their methods to the boundary and more generally to Hassett's moduli spaces $\overline M_{g, w}$ of stable nodal curves with weighted marked points. Algebraic manipulation of these relations brings them into a Faber-Zagier type form. We show that they give Pixton's generalized FZ relations when all weights are one. As a special case, we give a formulation of FZ relations for the n-fold product of the universal curve over $M_g$.

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