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arXiv 2103.16356math.AGmath.CV
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原辛簇上有理曲线的形变及其应用

Deformations of rational curves on primitive symplectic varieties and applications

Christian Lehn, Giovanni Mongardi, Gianluca Pacienza

摘要:

研究了本原辛簇上有理曲线的变形理论,证明了当有理曲线覆盖一个因子时,与光滑情形一样,它们沿Hodge轨迹进行泛局部平凡变形.作为应用,我们扩展Markman的变形不变性的总理例外因子沿其霍奇轨迹到这个奇异的框架,并提供存在的结果uniruled充分因子的原始辛簇是局部平凡变形的任何模空间的半稳定对象的投影$K3$或纤维的Albanese映射的阿贝尔表面上。我们还提出了一个应用程序的存在性素例外因子。

英文摘要:

We study the deformation theory of rational curves on primitive symplectic varieties and show that if the rational curves cover a divisor, then, as in the smooth case, they deform along their Hodge locus in the universal locally trivial deformation. As applications, we extend Markman's deformation invariance of prime exceptional divisors along their Hodge locus to this singular framework and provide existence results for uniruled ample divisors on primitive symplectic varieties which are locally trivial deformations of any moduli space of semistable objects on a projective $K3$ or fibers of the Albanese map of those on an abelian surface. We also present an application to the existence of prime exceptional divisors.

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