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arXiv 2304.02111gr-qcastro-ph.CO
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静态$f(R)$黑洞与薄吸积盘的观测特征

Observational signatures of a static $f(R)$ black hole with thin accretion disk

Mohsen Fathi, Norman Cruz

AI总结:

本研究通过解析和数值方法,探讨了具有线性暗物质参数的静态$f(R)$黑洞的薄吸积盘观测特征,发现该参数显著影响阴影大小和亮度,且亮度主要来自直接发射。

摘要:

在本研究中,我们聚焦于一个静态球对称的$f(R)$黑洞时空,其特征由一个与暗物质相关的线性参数描述。我们的研究旨在深入理解该参数的不同假设值对黑洞可观测特征的影响。为实现这一目标,我们通过零测地线的直接解析计算来推断光偏转角。为了进一步探究黑洞的性质,我们假设一个光学薄的吸积盘,并探讨各种发射轮廓。此外,我们研究了受吸积盘影响的被照亮黑洞所投射的阴影。我们还模拟了在黑洞剪影成像背景下,内落球形吸积的亮度。我们的发现表明,除某些特定情况外,吸积盘的可观测亮度主要源于直接发射,而非透镜效应和光子环。此外,我们揭示出黑洞的线性暗物质参数显著影响阴影的大小和亮度。我们的讨论涵盖了解析和数值方法,并利用射线追踪技术生成精确的可视化图像。

英文摘要:

In this study, we focus on a static spherically symmetric $f(R)$ black hole spacetime characterized by a linear dark matter-related parameter. Our investigation delves into understanding the influence of different assumed values of this parameter on the observable characteristics of the black hole. To fulfill this task, we investigate the light deflection angles, which are inferred from direct analytical calculations of null geodesics.} To examine the black hole's properties further, we assume an optically thin accretion disk and explore various emission profiles. Additionally, we investigate the shadow cast by the illuminated black hole when affected by the disk. Furthermore, we simulate the brightness of an infalling spherical accretion in the context of silhouette imaging for the black hole. Our findings indicate that, except for some specific cases, the observed brightness of the accretion disk predominantly arises from direct emission, rather than lensing and photon rings. Moreover, we reveal that the linear dark parameter of the black hole significantly influences the shadow size and brightness. Our discussion covers both analytical and numerical approaches, and we utilize ray-tracing methods to produce accurate visualizations.

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。

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