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arXiv 2007.12462gr-qc
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带电弦状黑洞周围的测试粒子的动力学能模仿克尔黑洞的自旋吗?

Can the dynamics of test particles around charged stringy black holes mimic the spin of Kerr black holes?

Bakhtiyor Narzilloev, Javlon Rayimbaev, Sanjar Shaymatov, Ahmadjon Abdujabbarov, Bobomurat Ahmedov, Cosimo Bambi

摘要:

我们研究带电粒子、磁单极子和磁偶极子在带电和磁带电弦状黑洞周围的运动。通过对带电粒子最内层稳定圆轨道半径(ISCO)的分析,我们证明了弦黑洞的电荷$Q$可以很好地模拟Kerr黑洞的自旋;黑洞磁荷$Q_m$可以模拟磁偶极子的自旋,最高可达$a_* \simeq 0.85$;磁偶极子的磁荷参数$g$可以模拟磁偶极子的自旋,最高可达$a_* \simeq 0.8$ .这是由于磁场的破坏性,这样的结果排除了在天体物理学黑洞中存在明显的黑洞磁荷,从观察快速旋转的物体与无量纲自旋高达$a_* \simeq 0.99$。然后,我们考虑磁星SGR(PSR)J1745-2900作为一个磁偶极子轨道的超大质量黑洞人马座A*(Sgr A*)。我们证明了Sgr A* 可以解释为一个带磁荷$Q_{\rm m}/M \leq 0.4118$的弦状黑洞。

英文摘要:

We study the motion of electrically charged particles, magnetic monopoles, and magnetic dipoles around electrically and magnetically charged stringy black holes. From the analysis of the radius of the innermost stable circular orbit (ISCO) of electrically charged particles, we show that the electric charge $Q$ of stringy black holes can mimic well the spin of Kerr black holes; the black hole magnetic charge $Q_m$ can mimic spins up to $a_* \simeq 0.85$ for magnetic dipoles; the magnetic charge parameter $g$ of a magnetic monopole can mimic spins up to $a_* \simeq 0.8$. This is due to the destructive character of the magnetic field and such a result excludes the existence of an appreciable black hole magnetic charge in astrophysical black holes from the observation of rapidly rotating objects with dimensionless spin up to $a_* \simeq 0.99$. We then consider the magnetar SGR (PSR) J1745-2900 as a magnetic dipole orbiting the supermassive black hole Sagittarius A* (Sgr A*). We show that Sgr A* may be interpreted as a stringy black hole with magnetic charge $Q_{\rm m}/M \leq 0.4118$.

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