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arXiv 1503.05540gr-qcmath.DG
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关于边际外陷2-球面刚性的一个注记

A note on the rigidity of marginally outer trapped 2-spheres

Gregory J. Galloway

摘要:

正如本文所讨论的,在充满物质的时空中,也许有正的宇宙学常数,一个稳定的边缘外陷2-球必须满足一定的面积不等式。也就是说,它的面积必须以$4π/c$为界,其中$c > 0$是自然能量动量项的下界。在本说明中,我们考虑的刚性,结果稳定,或弱最外,边缘外捕获2-球,达到这个上限的面积。Vaidya时空中的“正则”动力学视界和Nariai时空中的某些类空超曲面为主要结果提供了例证。这些结果可以看作是Bray,Brendle和Neves [10]关于具有正下界的标量曲率的黎曼3-流形中面积极小化2-球面的刚性结果的时空模拟。

英文摘要:

As discussed in the paper, in a matter-filled spacetime, perhaps with positive cosmological constant, a stable marginally outer trapped 2-sphere must satisfy a certain area inquality. Namely, its area must be bounded above by $4π/c$, where $c > 0$ is a lower bound on a natural energy momentum term. In this note we consider the rigidity that results for stable, or weakly outermost, marginally outer trapped 2-spheres that achieve this upper bound on the area. The "canonical" dynamical horizon in Vaidya spacetime and certain spacelike hypersurfaces in Nariai spacetime provide illustrations of the main results. These results may be viewed as spacetime analogues of the rigidity results of Bray, Brendle and Neves [10] concerning area minimizing 2-spheres in Riemannian 3-manifolds with scalar curvature having positive lower bound.

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