arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.01928gr-qc
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黑洞的形状

Shape of black holes

María E. Gabach Clement

摘要:

众所周知,天体由于引力而趋向于球形,旋转会产生偏离这种球形的偏差。我们讨论了什么是已知的和预期的形状黑洞的视野,从他们的形成到他们的最终,稳定的状态。我们提出的一些最近的结果表明,黑洞旋转确实表现在扩大其中心区域,限制其整体形状,并强制其整个几何接近极端克尔视界几何在几乎最大的旋转速度。结果只与视界面积和角动量有关。特别是,它们完全独立于周围时空的几何形状和满足强能量条件的物质的存在。我们还讨论了这个结果与Hoop猜想的关系。

英文摘要:

It is well known that celestial bodies tend to be spherical due to gravity and that rotation produces deviations from this sphericity. We discuss what is known and expected about the shape of black holes' horizons from their formation to their final, stationary state. We present some recent results showing that black hole rotation indeed manifests in the widening of their central regions, limits their global shapes and enforces their whole geometry to be close to the extreme Kerr horizon geometry at almost maximal rotation speed. The results depend only on the horizon area and angular momentum. In particular they are entirely independent of the surrounding geometry of the spacetime and of the presence of matter satisfying the strong energy condition. We also discuss the the relation of this result with the Hoop conjecture.

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