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arXiv 1011.2175gr-qchep-thmath-phmath.MP
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利用判别标量曲率不变量对时空进行代数分类

Algebraic classification of spacetimes using discriminating scalar curvature invariants

Alan Coley, Sigbjorn Hervik

摘要:

外尔张量和里奇张量可以用排列理论在任意维的洛伦兹时空中进行代数分类。与提升权重分解和曲率算子一起使用,则可以分别利用其特征向量和特征值结构来细化更高维度的Weyl张量和Ricci张量的代数分类。特别是,对于一个特定代数类型的张量,相关的算子将具有一个受限的本征向量结构,这可以用来确定一个特定代数类型的必要条件。我们将分析算子特征值的相关特征方程的判别式,以确定给定代数类型的(相关)曲率张量的条件。我们将描述一个算法,使我们能够完全确定的曲率算子的本征值结构,退化,在一组判别式。然后,我们表示这些条件(判别式)在这些多项式曲率不变量。特别是,我们可以使用所描述的技术来研究任意维的Weyl和Ricci曲率算子(以及更高维的Weyl和Ricci张量)是代数II型或D型的必要条件,并创建满足特殊代数类型所必需的合偶。因此,我们能够确定的必要条件,在简单的标量多项式曲率不变量,以使高维Weyl和Ricci张量是II型或D。我们明确确定的标量多项式曲率不变量的Weyl或Ricci张量是II型或D在5D。一些简单的例子,特别是,我们提出了一个详细的分析,一个重要的例子,一个5D旋转黑环。

英文摘要:

The Weyl and Ricci tensors can be algebraically classified in a Lorentzian spacetime of arbitrary dimensions using alignment theory. Used in tandem with the boost weight decomposition and curvature operators, the algebraic classification of the Weyl tensor and the Ricci tensor in higher dimensions can then be refined utilizing their eigenbivector and eigenvalue structure, respectively. In particular, for a tensor of a particular algebraic type, the associated operator will have a restricted eigenvector structure, and this can then be used to determine necessary conditions for a particular algebraic type. We shall present an analysis of the discriminants of the associated characteristic equation for the eigenvalues of an operator to determine the conditions on (the associated) curvature tensor for a given algebraic type. We will describe an algorithm which enables us to completely determine the eigenvalue structure of the curvature operator, up to degeneracies, in terms of a set of discriminants. We then express these conditions (discriminants) in terms of these polynomial curvature invariants. In particular, we can use the techniques described to study the necessary conditions in arbitrary dimensions for the Weyl and Ricci curvature operators (and hence the higher dimensional Weyl and Ricci tensors) to be of algebraic type II or D, and create syzygies which are necessary for the special algebraic type to be fulfilled. We are consequently able to determine the necessary conditions in terms of simple scalar polynomial curvature invariants in order for the higher dimensional Weyl and Ricci tensors to be of type II or D. We explicitly determine the scalar polynomial curvature invariants for a Weyl or Ricci tensor to be of type II or D in 5D. A number of simple examples are presented and, in particular, we present a detailed analysis of the important example of a 5D rotating black ring.

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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