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arXiv 1406.0417gr-qcastro-ph.CO
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几类替代引力理论中理想流体绕黑洞运动的平衡位形

Equilibrium configuration of perfect fluid orbiting around black holes in some classes of alternative gravity theories

Sumanta Chakraborty

摘要:

研究了球对称时空中理想流体绕黑洞运动的流体动力学行为。为此,我们假设旋转的理想流体的角动量密度是均匀分布的。为了得到物质流入和流出的性质,画出了等势面的轮廓。已经注意到,由于角动量密度的减小而产生的边缘稳定的圆形轨道导致闭合的等势面以及允许吸积盘存在的尖点。另一方面,角动量密度的增长部分表现出中心环,稳定的配置是可能的。但禁止物质流入。在这项工作中讨论的解决方案中,带电的$F(R)$重力和爱因斯坦麦克斯韦高斯邦纳解决方案表现出流入和流出的物质与中心环存在。这些不同的吸积盘结构的完美流体属性这些时空天体物理的重要性。高曲率项的影响主要来自于黑洞视界附近的区域。因此,修正引力理论与广义相对论中吸积盘的结构差异可以作为这些替代引力理论的实验探索。

英文摘要:

The hydrodynamic behaviour of perfect fluid orbiting around black holes in spherically symmetric spacetime for various alternative gravity theories has been investigated. For this purpose we have assumed an uniform distribution for the angular momentum density of the rotating perfect fluid. The contours of equipotential surfaces are illustrated in order to obtain the nature of inflow and outflow of matters. It has been noticed that, the marginally stable circular orbits originating from decreasing angular momentum density lead to closed equipotential surfaces along with cusp allowing existence of accretion disks. On the other hand, the growing part of angular momentum density exhibits central rings for which stable configurations are possible. However inflow of matter is prohibited. Among the solutions discussed in this work, the charged $F(R)$ gravity and Einstein-Maxwell-Gauss-Bonnet solution exhibit inflow and outflow of matter with central rings present. These varied accretion disk structure of perfect fluid attribute these spacetimes astrophysical importance. The effect of higher curvature terms predominantly arises from region near the black hole horizon. Hence the structural difference of accretion disk in modified gravity theories with comparison to general relativity may act as an experimental probe for these alternative gravity theories.

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