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arXiv 1006.1671math.DG
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基于李代数上同调的对称性

Symmetry via Lie algebra cohomology

Michael Eastwood

摘要:

黎曼流形上的Killing算子是向量场上的线性微分算子,其核提供无穷小黎曼对称。Killing算子最好用它的延拓来理解,这需要一些简单的张量恒等式。这些简单的恒等式可以被看作是由某些李代数上同调的识别而产生的。关键是,这种情况为更复杂的类似于对称性的算子提供了一个模型。

英文摘要:

The Killing operator on a Riemannian manifold is a linear differential operator on vector fields whose kernel provides the infinitesimal Riemannian symmetries. The Killing operator is best understood in terms of its prolongation, which entails some simple tensor identities. These simple identities can be viewed as arising from the identification of certain Lie algebra cohomologies. The point is that this case provides a model for more complicated operators similarly concerned with symmetry.

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