Sultana-Dyer时空中的裸奇点
Naked Singularity in the Sultana-Dyer Space-Time
摘要：
如何描述膨胀宇宙中的黑洞是一个重要的课题。通过假设度规是Schwarzschild度规或各向同性黑洞度规的共形变换，提出了关于这个问题的一些模型。然而，在这两个度量中存在裸奇点。最近，有人认为Sultana-Dyer时空中的奇点被一个视视界面所覆盖。但我们发现，如果零能条件成立，则这种视视界不存在。
英文摘要：
How to describe a black hole embedded in an expanding universe is an important topic. Some models about this issue are suggested by assuming that the metric is a conformal transformation of the Schwarzschild metric or of the isotropic black hole metric. However, there exists naked singularities in the two metrics. Recently, it is argued that the singularity in the Sultana-Dyer space-time is covered by an apparent horizon surface. But we find that such an apparent horizon does not exist if the null energy condition holds.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
