arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1111.1395math.AG
收藏

双EPW-六次曲线的模

Moduli of double EPW-sextics

Kieran G. O'Grady

摘要:

本文研究了由SL_6的自然作用所构造的\bigwedge^3{\mathbb C}^6的辛格拉斯曼参数化拉格朗日子空间的GIT商,称之为M.这是光滑二重EPW-六次线的模空间的紧化。我们确定了稳定点,GIT边界的不可约分量及其维数。有很强的类比与模空间的立方4倍:我们证明了一个结果,这是类似于一个定理的拉扎说,立方4倍简单的奇点是稳定的。我们的最终目标(没有实现在本文件中)是了解从M的Baily-Borel紧化的相关期间域模算术群的周期映射。考虑到这一目标,我们分析了M的GIT边界中的轨迹,其中周期映射是不规则的:我们证明了它有两个不可约分量,一个是3维,另一个是1维。我们的结果表明,M同构于Looijenga的紧化与3个特定的超平面在周期域。

英文摘要:

We study the GIT quotient of the symplectic grassmannian parametrizing lagrangian subspaces of \bigwedge^3{\mathbb C}^6 by the natural action of SL_6, call it M. This is a compactification of the moduli space of smooth double EPW-sextics. We determine the stable points, the irreducible components of the GIT boundary and their dimensions. There are strong analogies with the moduli space of cubic 4-folds: we prove a result which is analogous to a theorem of Laza stating that cubic 4-folds with simple singularities are stable. Our final goal (not achieved in the present paper) is to understand the period map from M to the Baily-Borel compactification of the relevant period domain modulo an arithmetic group. With this goal in mind we analyze the locus in the GIT-boundary of M where the period map is not regular: we prove that it has two irreducible components, one of dimension 3, the other of dimension 1. Our results suggests that M is isomorphic to Looijenga's compactification associated to 3 specific hyperplanes in the period domain.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑