论文标题
带电的丝状黑洞周围的测试颗粒的动力学模仿Kerr黑洞的旋转吗？
Can the dynamics of test particles around charged stringy black holes mimic the spin of Kerr black holes?
论文作者
论文摘要
我们研究电动颗粒，磁性单极和磁性偶极子的运动，周围是电动带电荷的丝状黑洞的运动。从电动颗粒的最内向稳定圆形轨道（ISCO）半径的分析中，我们表明，电荷的电荷$ q $ Q $ Q $可以很好地模仿Kerr黑洞的旋转；黑洞磁性电荷$ q_m $可以模仿磁极旋转的最多$ a_* \ simeq 0.85 $；磁性单极的磁性电荷参数$ g $可以模仿$ a_* \ simeq 0.8 $。这是由于磁场的破坏性特征，因此由于观察快速旋转的物体，无尺寸旋转至$ a_* \ simeq 0.99 $，因此排除了天体物理黑洞中可观的黑洞磁电荷的存在。然后，我们将Magnetar SGR（PSR）J1745-2900视为绕超级质量黑洞Sagittarius A*（SGR A*）绕的磁偶极子。我们表明，SGR A*可以解释为带有磁性电荷的刺激黑洞$ Q _ {\ rm m}/m \ leq 0.4118 $。
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 $Q_{\rm m}/M \leq 0.4118$.
