arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2109.09688math.DGmath.AGmath.RTmath.SG
收藏

有理齐次簇上的Kähler-里奇流

Kähler-Ricci flow on rational homogeneous varieties

Eder Correa

摘要:

在这项工作中,我们研究的Kähler-里奇流的合理齐次品种探索之间的相互作用,射影代数几何和表示论,这是经典的Borel-Weil定理。利用半单李群和李代数的表示论,给出了有理齐次簇上齐次Kähler-里奇流的所有解的一个显式描述.这种描述使我们能够明确地计算任何齐次解的最大存在时间,并获得明确的上界和下界的几个几何量沿流,包括曲率,体积,直径,和第一个非零特征值的拉普拉斯算子。作为我们的主要结果的应用,我们研究了与充分因子相关的数值不变量和由齐次Kähler-里奇流的解产生的数值不变量之间的关系.在满旗簇的特殊情况下,我们证明了从齐次Kähler-里奇流的解中得到的数值不变量可以与出现在某些不同背景下的某些著名不变量相关联,这些不变量包括大量线丛的全局Seshadri常数,辛球和Kähler球嵌入的最大可能半径,以及大量$\mathbb{Q}$ -因子的对数正则阈值.从这一点上,我们得到的标量和里奇曲率方面的限制,分别为辛嵌入的开放欧几里德球,并为平凡的解析乘数理想层定义的充足的$\mathbb{Q}$ -因子。

英文摘要:

In this work, we study the Kähler-Ricci flow on rational homogeneous varieties exploring the interplay between projective algebraic geometry and representation theory which underlies the classical Borel-Weil theorem. By using elements of representation theory of semisimple Lie groups and Lie algebras, we give an explicit description for all solutions of the homogeneous Kähler-Ricci flow on rational homogeneous varieties. This description enables us to compute explicitly the maximal existence time for any homogeneous solution and obtain explicit upper and lower bounds for several geometric quantities along the flow, including curvatures, volume, diameter, and the first non-zero eigenvalue of the Laplacian. As an application of our main result, we investigate the relationship between numerical invariants associated to ample divisors and numerical invariants arising from solutions of the homogeneous Kähler-Ricci flow. In the particular setting of full flag varieties, we prove that the numerical invariants obtained from solutions of the homogeneous Kähler-Ricci flow can be related to certain well-known invariants which appear in some different contexts, including the global Seshadri constant of ample line bundles, the maximum possible radius of embeddings of symplectic and Kähler balls, and the log canonical threshold of ample $\mathbb{Q}$-divisors. From this, we obtain constraints in terms of the scalar and Ricci curvatures, respectively, for symplectic embeddings of open Euclidean balls, and for the triviality of analytic multiplier ideal sheaves defined by ample $\mathbb{Q}$-divisors.

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。

↑