Cartan Invariants and Event Horizon Detection, Extended Version
D. D. McNutt, M. A. H. MacCallum, D. Gregoris, A. Forget, A. A. Coley, P. C. Chavy-Waddy, D. Brooks
备注：
17 pages. This is an extended version of the article published in General Relativity and gravitation, it includes additional examples. Equations in sections 4 and 6 have been corrected
We show that it is possible to locate the event horizons of a black hole (in arbitrary dimensions) as the zeros of certain Cartan invariants. This approach accounts for the recent results on the detection of stationary horizons using scalar polynomial curvature invariants, and improves upon them since the proposed method is computationally less expensive. As an application, we produce Cartan invariants that locate the event horizons for various exact four-dimensional and five-dimensional stationary, asymptotically flat (or (anti) de Sitter) black hole solutions and compare the Cartan invariants with the corresponding scalar curvature invariants that detect the event horizon. In particular, for each of the four-dimensional examples we express the scalar polynomial curvature invariants introduced by Abdelqader and Lake in terms of the Cartan invariants and show a direct relationship between the scalar polynomial curvature invariants and the Cartan invariants that detect the horizon.
The Hamiltonian formulation of N-bein, Einstein-Cartan, gravity in any dimension: the Progress Report (Extended version of a talk given on CAIMS-2009, June 11-14, London, Canada)
本文分析了N-bein、Einstein-Cartan、引力的哈密顿形式，在任何大于2的维数上，都采用一阶形式。这个哈密顿公式允许明确地显示三维情况下的特殊性（\textit{A.M.Frolov et al, 0902.0856 [gr-qc]}）发生并根据本报告中的结果推测，存在一个一般的N-bein重力公式的\textit{all}维度特征：在消除第二类约束之后，剩余的第一类次级约束中的Poisson括号的代数是Poincare代数，并且在所有维度N中，bein，Cartan-Einstein，重力\textit{is the Poincare gauge theory}。对应于第一类约束代数的规范对称性有两个参数--旋转（洛伦兹）和平移。平移不变性对所有维度都是共同的，但在N-beins和连接的规范变换的一般表达式中，某些项在特定的三维情况下为零。我们的猜想的证明是详细概述。一些简单但繁琐的计算仍有待完成，以调用我们的猜想-定理，并将报告后。
