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arXiv 1603.09425gr-qc
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标量-张量-矢量引力中的黑洞吸积

Black hole accretion in scalar-tensor-vector gravity

Anslyn J. John

摘要:

我们研究了在标量-张量-矢量引力(STVG)中物质在黑洞上的吸积,也称为修正引力(MOG)。引力常量是$G=G_{N} (1 + α)$,其中$α$是理论中静态黑洞的常数。MOG黑洞是球对称的,其特征是有两个事件视界。落入黑洞的物质服从多方状态方程,在进入外视界之前经过两个临界点。我们得到的质量吸积率以及外临界点,临界速度和临界声速的解析表达式。我们的研究结果补充了现有的强场测试,如透镜效应和轨道运动,并可用于确定MOG的观测约束。

英文摘要:

We examine the accretion of matter onto a black hole in scalar--tensor--vector gravity (STVG) also known as modified gravity (MOG). The gravitational constant is $G=G_{N} (1 + α)$ where $α$ is a parameter taken to be constant for static black holes in the theory. The MOG black hole is spherically symmetric and characterised by two event horizons. The matter falling into the black hole obeys the polytrope equation of state and passes through two critical points before entering the outer horizon. We obtain analytical expressions for the mass accretion rate as well as for the outer critical point, critical velocity and critical sound speed. Our results complement existing strong field tests like lensing and orbital motion and could be used in conjunction to determine observational constraints on MOG.

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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