Black hole shadow in an expanding universe with a cosmological constant
Black hole shadow in an expanding universe with a cosmological constant
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DOI：
10.1103/physrevd.97.104062
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发表时间：
2018-04
影响因子：
5
通讯作者：
V. Perlick;O. Tsupko;G. Bisnovatyi-Kogan
中科院分区：
文献类型：
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作者：
V. Perlick;O. Tsupko;G. Bisnovatyi-Kogan
我们解析地研究了宇宙膨胀对Schwarzschild黑洞阴影的影响。我们假设膨胀只受宇宙常数的驱动，并使用Kottler(或Schwarzschild-de Sitter)时空作为嵌入De Sitter宇宙中的Schwarzschild黑洞的模型。我们计算了伴随着宇宙膨胀的观测者的阴影的角半径。结果表明，当观测器向无穷远移动时，阴影的角半径会缩小到一个非零的有限值。
We analytically investigate the influence of a cosmic expansion on the shadow of the Schwarzschild black hole. We suppose that the expansion is driven by a cosmological constant only and use the Kottler (or Schwarzschild–de Sitter) spacetime as a model for a Schwarzschild black hole embedded in a de Sitter universe. We calculate the angular radius of the shadow for an observer who is comoving with the cosmic expansion. It is found that the angular radius of the shadow shrinks to a nonzero finite value if the comoving observer approaches infinity.