The observation of gravitational wave opens a new window for both physics and astrophysics. Among the models of the formation of binary black holes (BHs), some suggest the existence of circumbinary disk, which may provide the material to ignite the electromagnetic radiation observable to modern astronomical facilities. In this work, we investigate the consequences of such circumbinary disk, with an emphasis on the reduction in the BH-BH merger timescale, i.e. the total time necessary for the gravitational wave events to happen. We find that, the circumbinary disk excites a tidal torque onto the BH-BH system, and it dominates the angular momentum transfer (outward) when the BH-BH separation a> xxx. Theoretical implications of this result are discussed.

引力波的观测为物理学和天体物理学打开了一扇新的窗口。在双星黑洞（BHs）形成的模型中，有些人认为存在环绕双星盘，这可能提供点燃现代天文设施可观测到的电磁辐射的材料。在这项工作中，我们研究了这种环绕双星盘的后果，重点是减少 BH-BH 合并时间尺度，即引力波事件发生所需的总时间。我们发现，当BH-BH分离a>xxx时，环双星盘在BH-BH系统上激发了一个潮汐力矩，并且它主导了角动量传递（向外）。讨论了这一结果的理论意义。