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arXiv 2402.08014math.AG
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对数负切线与根堆栈

Logarithmic negative tangency and root stacks

Luca Battistella, Navid Nabijou, Dhruv Ranganathan

AI总结:

本文研究稳定映射到正常交叠对的负切线阶问题,通过点状Gromov-Witten理论和根堆栈的Orbifold Gromov-Witten理论,定义了新的虚拟类,揭示了点状不变量与Orbifold不变量的联系,为零 genus 的对数-Orbifold 对比提供了完整图景。

摘要:

我们研究稳定映射到正常交叠对的可能负切线阶。存在两种独立模型:点状Gromov-Witten理论和根堆栈的Orbifold Gromov-Witten理论。利用点状映射空间的热带结构,我们定义并研究了点状理论的新虚拟类。该类源于Artin堆栈上的精炼交集积,产生了一个区分的点状Gromov-Witten不变量。在限制于零亏格时,这些不变量与Orbifold不变量一致,首先对光滑对,然后在经过充分细化的吹胀后对正常交叠对。这基于先前的工作,为零亏格的对数-Orbifold对比提供了完整图景,与分裂兼容,从而允许导入Orbifold技术,包括边界递归和环面局部化。同时,Johnston的同期工作利用这一对比,给出了Gross-Siebert内在镜像环的结合性的新证明。

英文摘要:

We study stable maps to normal crossings pairs with possibly negative tangency orders. There are two independent models: punctured Gromov-Witten theory of pairs and orbifold Gromov-Witten theory of root stacks with extremal ages. Exploiting the tropical structure of the punctured mapping space, we define and study a new virtual class for the punctured theory. This arises as a refined intersection product on the Artin fan, and produces a distinguished sector of punctured Gromov-Witten invariants. Restricting to genus zero, we show that these invariants coincide with the orbifold invariants, first for smooth pairs, and then for normal crossings pairs after passing to a sufficiently refined blowup. This builds on previous work to provide a complete picture of the logarithmic-orbifold comparison in genus zero, which is compatible with splitting and thus allows for the wholesale importation of orbifold techniques, including boundary recursion and torus localisation. Contemporaneous work of Johnston uses the comparison to give a new proof of the associativity of the Gross-Siebert intrinsic mirror ring.

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