arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2303.09856gr-qc
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参数化黑洞中有无等离子体介质时的偏转角演化

Deflection angle evolution with plasma medium and without plasma medium in a parameterized black hole

Xiaoling He, Tianyu Xu, Yun Yu, Anosha Karamat, Rimsha Babar, Riasat Ali

摘要:

使用Keeton和Petters方法,我们确定偏转角。我们还研究了光子在非磁化冷等离子体中围绕参数化黑洞的运动。在球对称时空中,我们通过应用哈密顿方程来研究等离子体对偏转角和阴影的影响。通过分离度规和等离子体频率,从哈密顿方程中解析地导出射线。研究了等离子体的存在对参数化黑洞的偏转角和阴影的影响,它们依赖于等离子体的频率。如果等离子体频率明显低于光子频率,则光子球和阴影半径表达式可以在空间光线的值附近线性化。此外,我们还用图形分析了在等离子体频率和低密度等离子体介质的影响下,不同位置的阴影的行为。

英文摘要:

\begin{abstract} Using the Keeton and Petters approach, we determine the deflection angle. We also investigate the motion of photons around a parameterized black hole in the presence of non-magnetized cold plasma by using a new ray-tracing algorithm. In spherically symmetric spacetime, we examine the influence of the plasma by applying the Hamiltonian equation on the deflection angle as well as shadow. It is examine to derive the rays analytically from Hamilton's equation by separating the metric and the plasma frequency. We study that the presence of plasma affects the deflection angle as well as shadow for the parameterized black hole and they depend on plasma frequency. If the plasma frequency is significantly lower than the photon frequency, the photon sphere and shadow radius expressions can be linearized around the values found for space light rays. Furthermore, we have graphically analyze the behavior of shadow for distinct positions under the effects of plasma frequency as well as low density plasma medium.

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