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单词 Weil homomorphism
释义

Weil homomorphism

中文百科

陈-韦伊同态 Chern–Weil homomorphism

(重定向自Weil homomorphism)

数学上,陈-韦伊同态英语:Chern–Weil homomorphism)是陈-韦伊理论的基本构造,将一个光滑流形M的曲率联系到M的德拉姆上同调群,也就是从几何到拓扑。这个理论由陈省身和安德烈·韦伊于1940年代创建,是发展示性类理论的重要步骤。这个结果推广了陈-高斯-博内定理。

\mathbb K为实数域或复数域。设G为实或复李群,有李代数\mathfrak g,又记

\mathfrak g上的\mathbb K-值多项式的代数。设\mathbb K(\mathfrak g^*)^{Ad(G)}为在 \mathbb K(\mathfrak g^*)G的伴随作用的不动点的子代数,故对所有f\in\mathbb K(\mathfrak g^*)^{Ad(G)}

陈-韦伊同态是从\mathbb K(\mathfrak g^*)^{Ad(G)}到上同调代数H^*(M,\mathbb K)的一个\mathbb K-代数同态。这个同态存在,且对M上任何主G-丛P有唯一定义。若G紧致,则于此同态下,G-丛B的分类空间的上同调环同构于不变多项式的代数\mathbb K(\mathfrak g^*)^{Ad(G)}

英语百科

Chern–Weil homomorphism 陈-韦伊同态

(重定向自Weil homomorphism)

In mathematics, the Chern–Weil homomorphism is a basic construction in the Chern–Weil theory that computes topological invariants of vector bundles and principal bundles on a smooth manifold M in terms of connections and curvature representing classes in the de Rham cohomology rings of M. That is, the theory forms a bridge between the areas of algebraic topology and differential geometry. It was developed in the late 1940s by Shiing-Shen Chern and André Weil, in the wake of proofs of the generalized Gauss–Bonnet theorem. This theory was an important step in the theory of characteristic classes.

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更新时间:2025/6/27 16:58:47