arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.02299math.AG
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二次扇、θ函数和Calabi-Yau对的模

Secondary fan, theta functions and moduli of Calabi-Yau pairs

Paul Hacking, Sean Keel, Tony Yue Yu

摘要:

我们猜想三元组模空间$(X,E=E_1+\dots+E_n,Θ)$的任何连通分支$Q$是单有理的,其中$X$是光滑的投射簇,$E$是具有0层的正规交叉反典范除子,每个$E_i$是光滑的,$Θ$是不包含$E$的任何0层的充分因子.更准确地说:注意到$Q$有一个自然嵌入到稳定对的Kollár-Shepherd-Barron-Alexeev模空间中,我们猜想诱导紧化允许一个有限复盖。我们构建了相关的完整的复曲面风扇,广义Gelfand-Kapranov-Zelevinski二次风扇的自反多面体。受镜像对称的启发,我们推测一个综合建设的普遍家庭在这个环面品种,作为投影的一层的分级代数与规范的基础上,其结构常数是由计数的非阿基米德解析磁盘。在法诺的情况下,并假设该镜子包含一个Zagliki开放环面,我们构建的拓扑泛族,推广家庭的Kapranov-Sturmfels-Zelevinski和Alexeev在环面的情况下。在del Pezzo曲面具有反正则圈的$(-1)$ -曲线的情况下,我们证明了完整的猜想。

英文摘要:

We conjecture that any connected component $Q$ of the moduli space of triples $(X,E=E_1+\dots+E_n,Θ)$ where $X$ is a smooth projective variety, $E$ is a normal crossing anti-canonical divisor with a 0-stratum, every $E_i$ is smooth, and $Θ$ is an ample divisor not containing any 0-stratum of $E$, is unirational. More precisely: note that $Q$ has a natural embedding into the Kollár-Shepherd-Barron-Alexeev moduli space of stable pairs, we conjecture that the induced compactification admits a finite cover by a complete toric variety. We construct the associated complete toric fan, generalizing the Gelfand-Kapranov-Zelevinski secondary fan for reflexive polytopes. Inspired by mirror symmetry, we speculate a synthetic construction of the universal family over this toric variety, as the Proj of a sheaf of graded algebras with a canonical basis, whose structure constants are given by counts of non-archimedean analytic disks. In the Fano case and under the assumption that the mirror contains a Zariski open torus, we construct the conjectural universal family, generalizing the families of Kapranov-Sturmfels-Zelevinski and Alexeev in the toric case. In the case of del Pezzo surfaces with an anti-canonical cycle of $(-1)$-curves, we prove the full conjecture.

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