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arXiv 0709.1199hep-thgr-qc
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Einstein-Gauss-Bonnet引力中的广义Misner-Sharp准局域质量

Generalized Misner-Sharp quasi-local mass in Einstein-Gauss-Bonnet gravity

Hideki Maeda, Masato Nozawa

摘要:

本文研究了在存在宇宙学常数的情况下,在爱因斯坦-高斯-邦纳引力中,具有对应于$(n-2)$维最大对称空间的对称性的高维时空中准局域质量的性质.我们假设高斯-博内耦合常数是非负的。准定域质量最近被一位作者定义为广义相对论中Misner-Sharp准定域质量的对应物。准局域质量是一个准局域守恒电荷,与由广义Kodama矢量构造的局域守恒电流相关联,并表现出与能量平衡定律相对应的统一第一定律。在渐近平坦的情况下,它收敛到类空无穷远处的Arnowitt-Deser-Misner质量,而在渐近AdS的情况下,它收敛到无穷远处的Padilla-Tekin和Padilla质量。在主能量条件下,我们证明了任何$k$的准局部质量的单调性,而对于$k=1$和具有附加条件的$k=0$,则证明了具有正则中心的非俘获超曲面上的正性,其中$k=\pm1,0$是等势面的每个空间截面的常截面曲率.在耦合常数之间的一种特殊关系下,对任何$k$,在没有上述假设的情况下,准定域质量都是正的。我们还利用广义Kodama向量对所有真空解进行了分类。最后,对进一步推广Lovelock引力中的准局域质量提出了几点建议。

英文摘要:

We investigate properties of a quasi-local mass in a higher-dimensional spacetime having symmetries corresponding to the isomertries of an $(n-2)$-dimensional maximally symmetric space in Einstein-Gauss-Bonnet gravity in the presence of a cosmological constant. We assume that the Gauss-Bonnet coupling constant is non-negative. The quasi-local mass was recently defined by one of the authors as a counterpart of the Misner-Sharp quasi-local mass in general relativity. The quasi-local mass is found to be a quasi-local conserved charge associated with a locally conserved current constructed from the generalized Kodama vector and exhibits the unified first law corresponding to the energy-balance law. In the asymptotically flat case, it converges to the Arnowitt-Deser-Misner mass at spacelike infinity, while it does to the Deser-Tekin and Padilla mass at infinity in the case of asymptotically AdS. Under the dominant energy condition, we show the monotonicity of the quasi-local mass for any $k$, while the positivity on an untrapped hypersurface with a regular center is shown for $k=1$ and for $k=0$ with an additional condition, where $k=\pm1,0$ is the constant sectional curvature of each spatial section of equipotential surfaces. Under a special relation between coupling constants, positivity of the quasi-local mass is shown for any $k$ without assumptions above. We also classify all the vacuum solutions by utilizing the generalized Kodama vector. Lastly, several conjectures on further generalization of the quasi-local mass in Lovelock gravity are proposed.

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