标题： 热磁化等离子体中的不对齐自旋双黑洞合并 显示英文标题

标题： Misaligned Spinning Binary Black Hole Mergers in Hot Magnetized Plasma

摘要： 我们展示了嵌入在磁化气体云中的等质量自旋黑洞双星合并的广义相对论磁流体动力学模拟。 我们关注自旋方向相对于轨道角动量对流动动力学、质量吸积率和庞廷光度的影响。 我们发现，在 inspiral 过程中，流向单个黑洞的气体集中在盘状高密度区域，其角动量朝向自旋轴，并在合并前持续存在。 我们在质量吸积率中识别出周期性调制，幅度为 1-20%，并与引力波 chirp 并行演化。 吸积率时间序列与引力波应变之间的相似性是由于在靠近 inspiralling 黑洞附近强而动态的引力场和磁场之间的相互作用。 这一结果表明，大质量双星合并前吸积率的准周期性并不局限于黑洞嵌入环双星吸积盘的环境，可能为低频引力波探测同时发生的电磁辐射提供额外有用的特征。 显示英文摘要

摘要： We present general relativistic magneto-hydrodynamical simulations of equal-mass spinning black hole binary mergers embedded in a magnetized gas cloud. We focus on the effect of the spin orientation relative to the orbital angular momentum on the flow dynamics, mass accretion rate and Poynting luminosity. We find that, across the inspiral, the gas accreting onto the individual black holes concentrates into disk-like overdensities, whose angular momenta are oriented towards the spin axes and which persist until merger. We identify quasi-periodic modulations occurring in the mass accretion rate at the level of 1-20%, evolving in parallel with the gravitational wave chirp. The similarity between the accretion rate time-series and the gravitational strain is a consequence of the interplay between strong, dynamical gravitational fields and magnetic fields in the vicinity of the inspiralling black holes. This result suggests that quasi-periodicity in the pre-merger accretion rate of massive binaries is not exclusive of environments in which the black holes are embedded in a circumbinary accretion disk, and could provide an additional useful signature of electromagnetic emission concurrent to low-frequency gravitational wave detection.