标题： 扰动单极强迫磁场接近缓慢旋转黑洞的情况 显示英文标题

标题： Perturbing Monopolar Force-Free Magnetospheres to Slowly Rotating Black Holes

摘要： 我们研究了拖曳效应对旋转黑洞周围无阻力磁层结构的影响。 对于缓慢旋转的黑洞，解析探索通常集中在通过黑洞自旋的微扰，将适用于静态黑洞的精确无阻力解转化为近似适用于缓慢旋转黑洞的解。 我们表明，使用此类技术通常得到的唯一受扰单极解实际上是两类解之间的分界线：一类是磁场的径向分量朝向方位轴弯曲的解，另一类是朝向赤道平面弯曲的解。 这是因为拖曳效应影响了环向磁场分布，改变了径向磁场线间的力平衡。 显示英文摘要

摘要： We study the effects of frame-dragging on the structure of force-free magnetospheres around rotating black holes. For slowly rotating black holes, analytic explorations often focus on transforming an exact force-free solution applicable to a static black hole into a solution approximately applicable to a slowly-rotating black hole via perturbations in black hole spin. We show that the single perturbed monopolar solution most commonly arrived at using such techniques is in fact a separatrix between two broad classes of solutions: those with poloidal magnetic fields that bend upwards towards the azimuthal axis and those that bend downwards towards the equatorial plane. This is because frame-dragging affects the toroidal magnetic field distributions, changing the force balance between poloidal magnetic field lines.