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arXiv 1009.0225gr-qc
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具有球对称捕获面的区域,其核心及其边界

The region with trapped surfaces in spherical symmetry, its core, and their boundaries

Ingemar Bengtsson, José M. M. Senovilla

摘要:

我们考虑时空中包含未来捕获闭曲面的区域$\mathscr{T}$及其边界$\B$,并导出它们的一些一般性质。然后,我们集中讨论球对称的情况,但我们使用的方法是通用的,适用于其他情况。我们认为,封闭的陷阱表面有一个非本地的属性,“千里眼”,这是继承了$\B$。我们证明,$\B$是不是一个边际捕获管一般,它可以有部分地区的整个过去是平坦的。对于渐近平坦的黑洞,我们确定了一个一般的过去障碍,以及在事件视界内,在物理上合理的条件下的位置$\B$。我们还定义的核心$\mathscr{Z}$的捕获区域的部分$\mathscr{T}$,这是必不可少的,以维持封闭的捕获表面。我们证明了唯一的球对称动力视界是这样一个核心的边界,我们认为,这可能有助于挑选出来。为了说明结果,一些明确的例子进行了讨论,即罗伯逊-沃克几何和坍缩Vaidya时空。

英文摘要:

We consider the region $\mathscr{T}$ in spacetime containing future-trapped closed surfaces and its boundary $\B$, and derive some of their general properties. We then concentrate on the case of spherical symmetry, but the methods we use are general and applicable to other situations. We argue that closed trapped surfaces have a non-local property, "clairvoyance", which is inherited by $\B$. We prove that $\B$ is not a marginally trapped tube in general, and that it can have portions in regions whose whole past is flat. For asymptotically flat black holes, we identify a general past barrier, well inside the event horizon, to the location of $\B$ under physically reasonable conditions. We also define the core $\mathscr{Z}$ of the trapped region as that part of $\mathscr{T}$ which is indispensable to sustain closed trapped surfaces. We prove that the unique spherically symmetric dynamical horizon is the boundary of such a core, and we argue that this may serve to single it out. To illustrate the results, some explicit examples are discussed, namely Robertson-Walker geometries and the imploding Vaidya spacetime.

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