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arXiv 1201.6350math.AG
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稳定商不变量的镜像对称性

Mirror Symmetry for Stable Quotients Invariants

Yaim Cooper, Aleksey Zinger

摘要:

由Marian-Oprea-Pandharipande引入的稳定子的模空间提供了从非奇异曲线到非奇异投射簇的态射空间的自然紧化,并带有自然的虚类。我们表明,Givental的J-函数的扭曲的射影不变量的模拟描述了相同的镜像超几何级数作为相应的Gromov-Witten不变量(产生于稳定映射的模空间),但没有镜像变换(在Calabi-Yau的情况下)。这意味着,如果有足够的“积极性”,稳定的不变量和Gromov-Witten扭曲不变量一致,但不是在所有情况下。作为推论的证明,我们表明,某些扭曲的赫维茨数产生的稳定一致性理论也描述了一个基本的对象与此超几何级数。因此,我们完全回答了一些问题所提出的玛丽安Oprea Pandharipande关于他们的不变量。我们的研究结果表明,完整的交叉和镜像家庭的几何形状的稳定的平行不变量之间有着深刻的联系。在Gromov-Witten理论中,计算Givental的J-函数(本质上是一个生成函数的属0不变量与1个标记点)是计算稳定的不变量更高的属和更多的标记点的关键;我们利用这一点在即将发表的论文。

英文摘要:

The moduli space of stable quotients introduced by Marian-Oprea-Pandharipande provides a natural compactification of the space of morphisms from nonsingular curves to a nonsingular projective variety and carries a natural virtual class. We show that the analogue of Givental's J-function for the resulting twisted projective invariants is described by the same mirror hypergeometric series as the corresponding Gromov-Witten invariants (which arise from the moduli space of stable maps), but without the mirror transform (in the Calabi-Yau case). This implies that the stable quotients and Gromov-Witten twisted invariants agree if there is enough "positivity", but not in all cases. As a corollary of the proof, we show that certain twisted Hurwitz numbers arising in the stable quotients theory are also described by a fundamental object associated with this hypergeometric series. We thus completely answer some of the questions posed by Marian-Oprea-Pandharipande concerning their invariants. Our results suggest a deep connection between the stable quotients invariants of complete intersections and the geometry of the mirror families. As in Gromov-Witten theory, computing Givental's J-function (essentially a generating function for genus 0 invariants with 1 marked point) is key to computing stable quotients invariants of higher genus and with more marked points; we exploit this in forthcoming papers.

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