标题： 通过准周期振荡对磁化厄恩斯特黑洞时空的约束 显示英文标题

标题： Constraints on the magnetized Ernst black hole spacetime through quasiperiodic oscillations

摘要： 我们研究了磁化恩斯特黑洞周围测试粒子的动力学，考虑了黑洞周围环境中的磁场。 我们展示了其磁场如何影响粒子以及黑洞周围的周期运动。 基于分析，我们发现中性及带电测试粒子的最内稳定圆轨道（ISCO）半径以及周期频率受到磁场影响显著改变。 我们还表明，带电粒子的ISCO半径迅速减小。 结果表明，引力和磁场的洛伦兹力相结合，从而显著缩小了带电测试粒子的ISCO值。 最后，我们得到了周期频率的一般形式，并选取三个具有已知天体物理准周期振荡（QPO）数据的微类星体来限制磁场。我们表明，在考虑中性粒子围绕黑洞圆周运动的情况下，磁场的数量级为$B\sim 10^{-7}$高斯。 显示英文摘要

摘要： We study the dynamics of test particles around a magnetized Ernst black hole considering its magnetic field in the environment surrounding the black hole. We show how its magnetic field can influence the dynamics of particles and epicyclic motion around the black hole. Based on the analysis, we find that the radius of the innermost stable circular orbit (ISCO) for both neutral and charged test particles and epicyclic frequencies are strongly affected by the influence of the magnetic field. We also show that the ISCO radius of charged particles decreases rapidly. It turns out that the gravitational and Lorentz forces of the magnetic field are combined, thus strongly shrinking the values of the ISCO of charged test particles. Finally, we obtain the generic form for the epicyclic frequencies and select three microquasars with known astrophysical quasiperiodic oscillation (QPO) data to constrain the magnetic field.We show that the magnetic field is of the order of magnitude $B\sim 10^{-7}$ Gauss, taking into account the motion of neutral particles in circular orbit about the black hole.