arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.06943gr-qc
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强裸奇点的观测特征:薄吸积盘的图象

Observational signatures of strongly naked singularities: image of the thin accretion disk

Galin Gyulchev, Jutta Kunz, Petya Nedkova, Tsvetan Vetsov, Stoytcho Yazadjiev

摘要:

研究了强裸静态Janis-Newman-Winicour奇点周围薄吸积盘的光学现象。该溶液不具有光子球,这导致在盘图像的中心区域形成复杂的亮环结构。在具有薄的吸积盘的史瓦西黑洞的情况下,这种结构是不存在的,在那里我们观察到的不是图像,而是黑洞的阴影。有些环从吸积盘发出最大的可观测辐射通量,应该可以通过实验探测到。因此,这个定性的新特征可以用来区分观测上的黑洞和裸奇点。我们通过揭示其形成的物理机制来阐明环状结构的外观,并解释每个环状图像的性质。我们猜想,对于其他不含光子球的解,也会出现类似的结构,它可以作为区分不含光子球的致密天体和黑洞的一般观测特征。

英文摘要:

We study the optical appearance of a thin accretion disk around the strongly naked static Janis-Newman-Winicour singularity. The solution does not possess a photon sphere, which results in the formation of a complex structure of bright rings in the central region of the disk image. Such structure is absent in the case of the Schwarzschild black hole with a thin accretion disk, where instead of the image we observe the black hole shadow. Some of the rings emit with the maximal observable radiation flux from the accretion disk, and should be experimentally detectable. Thus, this qualitatively new feature can be used to distinguish observationally black holes from naked singularities. We elucidate the appearance of the ring structure by revealing the physical mechanism of its formation, and explaining the nature of each of the ring images. We make the conjecture that a similar structure would also appear for other solutions without a photon sphere and it can serve as a general observational signature for distinguishing compact objects possessing no photon sphere from black holes.

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