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arXiv math/0006186math.DGmath.AG
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Hermite对称空间中极值圈的刚性与拟刚性

Rigidity and quasi-rigidity of extremal cycles in Hermitian symmetric spaces

Robert L. Bryant

摘要:

我使用局部微分几何技巧证明了厄米特对称空间中某些极值同调类中的代数圈要么是刚性的(即,仅通过环境运动可变形)或准刚性(粗略地说,以非平凡的方式由刚性子变种形成叶状)。这些刚性结果有许多应用:首先,它们证明了Grassmannian和其他Hermitian对称空间中的许多子簇不能被平滑(即,不与光滑的子变种同源)。其次,他们给出了紧致Kahler流形上的全纯丛的特征,这些全纯丛由其整体瓣生成,但其Chern类中的某些多项式为零(例如,c_2 = 0,c_1 c_2- c_3 = 0,c_3 = 0等)。

英文摘要:

I use local differential geometric techniques to prove that the algebraic cycles in certain extremal homology classes in Hermitian symmetric spaces are either rigid (i.e., deformable only by ambient motions) or quasi-rigid (roughly speaking, foliated by rigid subvarieties in a nontrivial way). These rigidity results have a number of applications: First, they prove that many subvarieties in Grassmannians and other Hermitian symmetric spaces cannot be smoothed (i.e., are not homologous to a smooth subvariety). Second, they provide characterizations of holomorphic bundles over compact Kahler manifolds that are generated by their global sections but that have certain polynomials in their Chern classes vanish (for example, c_2 = 0, c_1c_2 - c_3 = 0, c_3 = 0, etc.).

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。

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