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arXiv math/0608590math.AG
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Hurwitz-Hodge积分的Generating Functions

Generating Functions for Hurwitz-Hodge Integrals

Renzo Cavalieri

摘要:

本文给出了一类Hurwitz-Hodge积分的显式生成函数。这些积分重言式类的模空间的容许覆盖,(堆叠)光滑紧化的赫尔维茨计划。容许覆盖及其重言类本身就是有趣的数学对象,但最近它们被证明是研究曲线的模空间的重言环和DM栈的轨道Gromov-Witten理论的有用工具。我们的主要工具是Atiyah-Bott本地化:它的基本理念是将一个有趣的几何问题转化为一个纯粹的组合问题。

英文摘要:

In this paper we describe explicit generating functions for a large class of Hurwitz-Hodge integrals. These are integrals of tautological classes on moduli spaces of admissible covers, a (stackily) smooth compactification of the Hurwitz schemes. Admissible covers and their tautological classes are interesting mathematical objects on their own, but recently they have proved to be a useful tool for the study of the tautological ring of the moduli space of curves, and the orbifold Gromov-Witten theory of DM stacks. Our main tool is Atiyah-Bott localization: its underlying philosophy is to translate an interesting geometric problem into a purely combinatorial one.

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