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arXiv 2106.14697gr-qcastro-ph.HE
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在爱因斯坦-高斯-邦纳引力中致密天体周围的薄吸积盘图像

Image of the thin accretion disk around compact objects in the Einstein-Gauss-Bonnet gravity

Galin Gyulchev, Petya Nedkova, Tsvetan Vetsov, Stoytcho Yazadjiev

摘要:

本文研究了在Einstein-Gauss-Bonnet引力作用下致密天体周围薄吸积盘的光学现象。考虑静态球对称黑洞和裸奇点,我们搜索的特征签名,可以出现在可观察到的图像由于修改广义相对论。虽然高斯-博内黑洞的图像与史瓦西黑洞非常相似,但裸奇点具有独特的特征。一系列明亮的环形成在图像的中心部分,可观测到的辐射比其余部分的通量大$10^3$倍,使它们具有观测意义。我们阐明了导致中心环出现的物理机制,表明图像是由时空的光环结构决定的。在参数空间的某个区域内,高斯-博内裸奇点具有一个稳定的和一个不稳定的光环。此外,引力场在奇点的某个邻域内变成排斥场。这种特征的组合导致了中心环的形成,这意味着这种效应并不只限于爱因斯坦-高斯-邦纳引力,但也会出现在任何其他具有相同光子动力学特征的紧凑物体上。

英文摘要:

We study the optical appearance of a thin accretion disk around compact objects within the Einstein-Gauss-Bonnet gravity. Considering static spherically symmetric black holes and naked singularities we search for characteristic signatures which can arise in the observable images due to the modification of general relativity. While the images of the Gauss-Bonnet black holes closely resemble the Schwarzschild black hole, naked singularities possess a distinctive feature. A series of bright rings are formed in the central part of the images with observable radiation $10^3$ times larger than the rest of the flux making them observationally significant. We elucidate the physical mechanism, which causes the appearance of the central rings, showing that the image is determined by the light ring structure of the spacetime. In a certain region of the parametric space the Gauss-Bonnet naked singularities possess a stable and an unstable light ring. In addition the gravitational field becomes repulsive in a certain neighbourhood of the singularity. This combination of features leads to the formation of the central rings implying that the effect is not specific for the Einstein-Gauss-Bonnet gravity but would also appear for any other compact object with the same characteristics of the photon dynamics.

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