Quasilocal energy and surface geometry of Kerr spacetime

Quasilocal energy and surface geometry of Kerr spacetime
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克尔时空的准局部能量和表面几何

DOI:
10.1103/physrevd.95.084042
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发表时间:
2016-06
期刊:
影响因子:
5
通讯作者:
Liu Jian Liang
Liu Jian Liang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yu Chengjie;Liu Jian Liang

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本文在不采用慢旋转近似的情况下,研究了Boyer-Lindquist坐标下Kerr时空的准局域能量(QLE)和表面几何。我们还考虑了在区域$rr_{k}(A)$中,具有常数$t,r$的曲面的高斯曲率为正,并且对于$r>\sqrt{3}a$,QLE的临界值为正。我们发现三条曲线:外视界$r=r+}(A)$,$r=r{k}(A)$和$r=\sqrt{3}a$在点$a=\sqrt{3}m/2$相交,这是视界等距嵌入到$\mathbb{R}^3$[18]中的极限。数值结果表明,Kerr QLE从格层内区域单调减小到ADM$m$,再到大的$r$。对于增加$a$,QLE减小,但对于增加不可约质量$M{\mathm{Ir}}$,QLE增加。根据Chen-Wang-Yau[7]的结果,我们得出结论:在某个区域$r>r_{h}(A)$,Kerr QLE的临界值是全局最小值。
In this paper, we study the quasi-local energy (QLE) and the surface geometry for Kerr spacetime in the Boyer-Lindquist coordinate without taking the slow rotation approximation. We also consider in the region $r r_{k}(a)$, the Gaussian curvature is positive of the surface with constant $t,r$, and for $r>\sqrt{3}a$ the critical value of the QLE is positive. We found that the three curves: the outer horizon $r=r_{+}(a)$, $r=r_{k}(a)$ and $r=\sqrt{3}a$ intersect at the point $a=\sqrt{3}m/2$, which is the limit for the horizon to be isometrically embedded into $\mathbb{R}^3$ [18]. The numerical result indicates that the Kerr QLE is monotonically decreasing to ADM $m$ from the region inside the ergosphere to large $r$. For increasing $a$, the QLE is decreasing but for increasing irreducible mass $M_{\mathrm{ir}}$, QLE is increasing. From the results of Chen-Wang-Yau [7], we conclude that in a certain region $r>r_{h}(a)$, the critical value of the Kerr QLE is a global minimum.
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