论文标题
两体弛豫过程的综合作用和偏心的Kozai-Lidov机制对EMRI速率
The Combined Effects of Two-Body Relaxation Processes and the Eccentric Kozai-Lidov Mechanism on the EMRI Rate
论文作者
论文摘要
极端质量比率（EMRIS）的引力波（GW）排放是低频GW检测器的有前途来源。它们是由一个紧凑的物体产生的，例如由超级质量黑洞（SMBH）捕获的恒星质量黑洞（BH）。已经提出了几个物理过程来形成EMRI。特别是，已经提出了长期范围内的弱两体相互作用（即放松过程），这可能是将BH轨道驱动到高偏心率的可能机制。因此，它被SMBH捕获并成为EMRI。在这里，我们证明了Emris自然形成在SMBH二进制文件中。 SMBH伴侣的重力扰动，被称为偏心的Kozai-Lidov（EKL）机制，结合了弛豫过程，比单独运行的任何这些过程中的任何一个都产生的速度明显高得多。由于EKL对轨道构型敏感，因此两体弛豫可以改变轨道参数，从而以更具EKL的方式渲染系统。由于预计SMBH二进制文件在宇宙中很普遍，因此该过程预测EMRI的速率基本上。
Gravitational wave (GW) emissions from extreme-mass-ratio inspirals (EMRIs) are promising sources for low-frequency GW-detectors. They result from a compact object, such as a stellar-mass black-hole (BH), captured by a supermassive black hole (SMBH). Several physical processes have been proposed to form EMRIs. In particular, weak two-body interactions over a long time scale (i.e., relaxation processes) have been proposed as a likely mechanism to drive the BH orbit to high eccentricity. Consequently, it is captured by the SMBH and becomes an EMRI. Here we demonstrate that EMRIs are naturally formed in SMBH binaries. Gravitational perturbations from an SMBH companion, known as the eccentric Kozai-Lidov (EKL) mechanism, combined with relaxation processes, yield a significantly more enhanced rate than any of these processes operating alone. Since EKL is sensitive to the orbital configuration, two-body relaxation can alter the orbital parameters, rendering the system in a more EKL-favorable regime. As SMBH binaries are expected to be prevalent in the Universe, this process predicts a substantially high EMRI rate.
