论文标题
黑洞通过宇宙弹跳的生存
Survival of black holes through a cosmological bounce
论文作者
论文摘要
我们分析了一个黑洞是否可以存在并在通过宇宙弹跳的宇宙中生存。为此，我们调查了一个嵌入在由Comeving Pernive McVittie Metric模型的弹跳宇宙学背景中的中心不均匀性。与文献中可用的其他动态指标相反，该解决方案允许中心对象与宇宙流体的相互作用。我们表明，与宇宙时间变化相关的视野，因为它们与宇宙进化相连，因为中心物体的质量始终与规模因子成正比：在收缩过程中降低并在扩展阶段增加。在对该时空的因果结构进行了完整分析之后，我们确定在收缩，弹跳和延伸过程中，动态黑洞持续存在。该结果意味着有一类弹跳模型在所有宇宙学时代都接受黑洞。如果这些模型与真实宇宙的近似正确，那么存活的宇宙崩溃的黑洞可能会在随后的扩展阶段发挥一定作用。
We analyze whether a black hole can exist and survive in a universe that goes through a cosmological bounce. To this end, we investigate a central inhomogeneity embedded in a bouncing cosmological background modeled by the comoving generalized McVittie metric. Contrary to other dynamical metrics available in the literature, this solution allows for the interaction of the central object with the cosmological fluid. We show that the horizons associated with this metric change with cosmic time because they are coupled to the cosmic evolution as the mass of the central object is always proportional to the scale factor: it decreases during contraction and increases during expansion phases. After a full analysis of the causal structure of this spacetime, we determine that a dynamical black hole persists during the contraction, bounce, and expansion of the universe. This result implies that there is a class of bouncing models that admits black holes at all cosmological epochs. If these models are correct approximation to the real universe, then black holes surviving a cosmic collapse could play some role in the subsequent expanding phase.
