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arXiv math/0309217math.AG
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具有有效r-旋结构的曲线的模空间

Moduli spaces of curves with effective r-spin structures

Alexander Polishchuk

摘要:

我们引入了具有有效$r$ -自旋结构的尖曲线的模量栈:这些是有效因子$D$,使得$rD$是在标记点处修改的典范除子。我们证明了这个模空间是光滑的,并计算了它的维数。我们还证明,它总是包含一个组件,双有理项目的轨迹$S^0$在模空间的$r$-自旋曲线组成的$r$ -自旋结构$L$,使$h^0(L)\neq 0$。最后,研究了轨迹$S^0$与Witten的虚顶Chern类之间的关系.

英文摘要:

We introduce the moduli stack of pointed curves equipped with effective $r$-spin structures: these are effective divisors $D$ such that $rD$ is a canonical divisor modified at marked points. We prove that this moduli space is smooth and compute its dimension. We also prove that it always contains a component that projects birationally to the locus $S^0$ in the moduli space of $r$-spin curves consisting of $r$-spin structures $L$ such that $h^0(L)\neq 0$. Finally, we study the relation between the locus $S^0$ and Witten's virtual top Chern class.

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