标题： 围绕双星盘向旋转黑洞双星吸积 显示英文标题

标题： Circumbinary Disk Accretion into Spinning Black Hole Binaries

摘要： 超大质量黑洞双星很可能通过一个环绕双星的盘面吸积星际气体。 在即将合并之前，这个环绕双星盘的内侧部分会受到广义相对论效应的影响。 为了研究这一阶段，我们通过叠加两个增强的Kerr-Schild项来近似描述绕行黑洞的时空度规。 在证明了这种近似的质量之后，我们进行了长时间的广义相对论磁流体力学模拟，以研究环绕双星盘的行为。 我们考虑了无量纲自旋参数为0.9的黑洞，在一个模拟中，该自旋与双星轨道角动量平行；而在另一个模拟中则反平行。 这些结果与无自旋的模拟进行了对比。 我们发现，对于环绕双星盘内部的固定表面质量密度，这种大小的自旋如果方向一致大约会减少14%的质量吸积率，而反向自旋则会增加45%的质量吸积率，同时使盘的许多其他属性保持不变。 显示英文摘要

摘要： Supermassive black hole binaries are likely to accrete interstellar gas through a circumbinary disk. Shortly before merger, the inner portions of this circumbinary disk are subject to general relativistic effects. To study this regime, we approximate the spacetime metric of close orbiting black holes by superimposing two boosted Kerr-Schild terms. After demonstrating the quality of this approximation, we carry out very long-term general relativistic magnetohydrodynamic simulations of the circumbinary disk. We consider black holes with spin dimensionless parameters of magnitude 0.9, in one simulation parallel to the orbital angular momentum of the binary, but in another anti-parallel. These are contrasted with spinless simulations. We find that, for a fixed surface mass density in the inner circumbinary disk, aligned spins of this magnitude approximately reduce the mass accretion rate by 14% and counter-aligned spins increase it by 45%, leaving many other disk properties unchanged.