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Spacetimes of Weyl and Ricci type N in higher dimensions

机译:较高维的Weyl和Ricci N型时空

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摘要

We study the geometrical properties of null congruences generated by an aligned null direction of the Weyl tensor (WAND) in spacetimes of Weyl and Ricci type N (possibly with a non-vanishing cosmological constant) in an arbitrary dimension. We prove that a type N Ricci tensor and a type III or N Weyl tensor have to be aligned. In such spacetimes, the multiple WAND has to be geodetic. For spacetimes with type N aligned Weyl and Ricci tensors, the canonical form of the optical matrix in the twisting and non-twisting cases is derived and the dependence of the Weyl and the Ricci tensors and Ricci rotation coefficients on the affine parameter of the geodetic null congruence generated by the WAND is obtained.
机译:我们研究了在任意维度的Weyl和Ricci类型N(可能具有不变的宇宙学常数)的时空中,由Weyl张量(WAND)的对齐零方向生成的零全等的几何特性。我们证明类型N的Ricci张量和类型III或N的Weyl张量必须对齐。在这样的时空中,多次WAND必须是大地测量的。对于N型Weyl和Ricci张量对齐的时空,推导了在扭曲和非扭曲情况下光学矩阵的规范形式,并且Weyl和Ricci张量以及Ricci旋转系数对大地零点仿射参数的依赖性获得WAND产生的全等。

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