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arXiv 2004.06811gr-qc
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理想流体暗物质对外磁场中静态黑洞周围粒子运动的影响

Effect of perfect fluid dark matter on particle motion around a static black hole immersed in an external magnetic field

Sanjar Shaymatov, Daniele Malafarina, Bobomurat Ahmedov

摘要:

我们研究了在外部渐近均匀磁场存在下,被理想流体暗物质包围的静态球对称黑洞附近的粒子和光子运动。我们确定带电测试粒子的最内层稳定圆轨道(ISCO)的半径和不稳定的圆形光子轨道的半径,并表明暗物质的存在的影响缩小了ISCO和光子球半径的值。基于对ISCO半径的分析,我们进一步证明了暗物质和磁场的联合作用可以模拟Kerr黑洞的自旋直到$ a/M \approx 0.75-0.8$ .最后,我们考虑了暗物质的存在对黑洞附近碰撞粒子质心能量的影响。我们发现,随着暗物质参数值的增加,质心能量增加。这一结果,结合这样的事实,即在存在外部磁场的情况下,ISCO半径可以变得任意接近视界,导致可以通过碰撞过程提取的任意高的能量,类似于在超自旋克尔情况下观察到的。

英文摘要:

We investigate particle and photon motion in the vicinity of a static and spherically symmetric black hole surrounded by perfect fluid dark matter in the presence of an external asymptotically uniform magnetic field. We determine the radius of the innermost stable circular orbit (ISCO) for charged test particles and the radius for unstable circular photon orbits and show that the effect of the presence of dark matter shrinks the values of ISCO and photon sphere radii. Based on the analysis of the ISCO radius we further show that the combined effects of dark matter and magnetic field can mimic the spin of a Kerr black hole up to $ a/M \approx 0.75-0.8$. Finally, we consider the effect of the presence of dark matter on the center of mass energy of colliding particles in the black hole vicinity. We show that the center of mass energy grows as the value of the dark matter parameter increases. This result, in conjunction with the fact that, in the presence of an external magnetic field, the ISCO radius can become arbitrarily close to the horizon leads to arbitrarily high energy that can be extracted by the collision process, similarly to what is observed in the super-spinning Kerr case.

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