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arXiv 1902.07899gr-qchep-thmath.DG
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计算三维时空中的Killing矢量数

Counting the number of Killing vectors in a 3D spacetime

Masato Nozawa, Kentaro Tomoda

摘要:

我们设计了一个算法,它允许一个计数的数量Killing向量的洛伦兹流形的尺寸为3。我们的算法依赖于的Ricci张量和分支的权力错综复杂的主要痕迹根据所产生的相容性条件的Killing方程的微分不变量的值。作为说明的例子,我们分类的Lifshitz和PP波时空到一个层次的基础上,他们的对称性。本文还给出了一个包含4个Killing矢量的时空的完全分类。

英文摘要:

We devise an algorithm which allows one to count the number of Killing vectors for a Lorentzian manifold of dimension 3. Our algorithm relies on the principal traces of powers of the Ricci tensor and branches intricately according to the values of differential invariants arising from the compatibility conditions of the Killing equation. As illustrating examples, we classify the Lifshitz and pp-wave spacetimes into a hierarchy based on their level of symmetry. A complete classification of spacetimes admitting 4 Killing vectors is also presented.

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