论文标题
完美流体暗物质对浸入外部磁场静态黑洞周围的颗粒运动的影响
Effect of perfect fluid dark matter on particle motion around a static black hole immersed in an external magnetic field
论文作者
论文摘要
我们研究了静态和球形对称黑洞附近的粒子和光子运动，该黑洞在存在外部渐近均匀磁场的情况下被完美的流体暗物质包围。我们确定用于带电测试颗粒的最内向稳定圆形轨道（ISCO）的半径和不稳定的圆形光子轨道的半径，并表明存在暗物质的影响缩小了ISCO和光子球体半径的值。基于对ISCO半径的分析，我们进一步表明，暗物质和磁场的组合效应可以模仿高达$ A/M \ $ a/m \约0.75-0.8 $的Kerr Black Hole的自旋。最后，我们考虑了暗物质在黑洞附近碰撞颗粒的质量能量中心的影响。我们表明，随着暗物质参数的值增加，质量能的中心会增长。该结果结合了以下事实：在存在外部磁场的情况下，ISCO半径可以任意接近地平线会导致任意高能量，这与碰撞过程可以提取，这与超级旋转Kerr案中观察到的相似。
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.
