论文标题
在不对称的薄壳虫洞中自由垂下的恒星的观察性外观
Observational Appearance of a Freely-falling Star in an Asymmetric Thin-shell Wormhole
论文作者
论文摘要
最近有报道说，在后期，恒星的总亮度随时间而自由地掉落在黑洞中，并且根据光子球的数量，特定的观察者可以看到一两个系列闪光，强度降低。在本文中，我们在反射 - 对称虫洞中检查了一个插入恒星的观察性外观，该孔具有两个光子球，一个在虫洞的每一侧。我们发现，由于没有事件范围，远距离观察者测量的晚期总发光度逐渐衰减或保持大致恒定。此外，特定的观察者将在晚期在明亮的背景下检测到一些光闪烁。这些观察结果将提供一种新工具，将虫洞与黑洞，甚至具有多个光子球的黑洞区分开。
It has been recently reported that, at late times, the total luminosity of a star freely falling in black holes decays exponentially with time, and one or two series of flashes with decreasing intensity are seen by a specific observer, depending on the number of photon spheres. In this paper, we examine observational appearances of an infalling star in a reflection-asymmetric wormhole, which has two photon spheres, one on each side of the wormhole. We find that the late-time total luminosity measured by distant observers gradually decays with time or remains roughly constant due to the absence of the event horizon. Moreover, a specific observer would detect a couple of light flashes in a bright background at late times. These observations would offer a new tool to distinguish wormholes from black holes, even those with multiple photon spheres.
