arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1003.0597gr-qc
收藏

极值质量比极限下的双黑洞合并:多极分析

Binary black hole merger in the extreme-mass-ratio limit: a multipolar analysis

Sebastiano Bernuzzi, Alessandro Nagar

摘要:

在前人工作的基础上,我们提出了一种新的计算方法,计算了质量为$m_1$和$m_2$的非自旋黑洞在质量比极限为$m_1 m_2\ll(m_1+m_2)^2$的情况下,从准圆螺旋到坍落、合并和衰荡的过渡过程中产生的引力波辐射.系统的相对动力学计算{ \it,不作任何绝热近似},通过使用有效单体(EOB)描述,即通过用质量为$μ=m_1 m_2/(m_1+m_2)$的有效粒子在质量为$M=m_1+m_2$的(准)史瓦西背景中运动来表示二元体,并将其提交给$Ø(ν)$ 5 PN-图解的分析辐射反作用力,其中具有$ν=μ/M$。引力波发射是通过多极Regge-Wheeler-Zerilli型微扰方法计算的(在极限$ν\ll 1$下有效)。我们考虑三个质量比,$ν={10^{-2},10^{-3},10^{-4}}$,我们计算多极波形高达$\ell=8$。我们估计在准普遍和准测地线的部分暴跌阶段的能量和角动量损失,我们分析了结构的衰荡。我们计算了引力波发射赋予合并残余物的引力反冲或“反冲”,并强调了更高多极的重要性,以获得反冲的最终值$v/(cν^2)=0.0446$。我们最后表明,有一个{ \it优秀的分数协议}($\sim 10^{-3}$)(即使在暴跌)之间的5 PN EOB解析图解辐射反应通量和数值计算的引力波角动量通量。这进一步证实了EOB形式主义准确建模极端质量比吸气的能力,这是未来天基LISA引力波探测器所需要的。

英文摘要:

Building up on previous work, we present a new calculation of the gravitational wave (GW) emission generated during the transition from quasi-circular inspiral to plunge, merger and ringdown by a binary system of nonspinning black holes, of masses $m_1$ and $m_2$, in the extreme mass ratio limit, $m_1 m_2\ll(m_1+m_2)^2$. The relative dynamics of the system is computed {\it without making any adiabatic approximation} by using an effective one body (EOB) description, namely by representing the binary by an effective particle of mass $μ=m_1 m_2/(m_1+m_2)$ moving in a (quasi-)Schwarzschild background of mass $M=m_1+m_2$ and submitted to an $Ø(ν)$ 5PN-resummed analytical radiation reaction force, with $ν=μ/M$. The gravitational wave emission is calculated via a multipolar Regge-Wheeler-Zerilli type perturbative approach (valid in the limit $ν\ll 1$). We consider three mass ratios, $ν={10^{-2},10^{-3},10^{-4}}$,and we compute the multipolar waveform up to $\ell=8$. We estimate energy and angular momentum losses during the quasi-universal and quasi-geodesic part of the plunge phase and we analyze the structure of the ringdown. We calculate the gravitational recoil, or "kick", imparted to the merger remnant by the gravitational wave emission and we emphasize the importance of higher multipoles to get a final value of the recoil $v/(cν^2)=0.0446$. We finally show that there is an {\it excellent fractional agreement} ($\sim 10^{-3}$) (even during the plunge) between the 5PN EOB analytically-resummed radiation reaction flux and the numerically computed gravitational wave angular momentum flux. This is a further confirmation of the aptitude of the EOB formalism to accurately model extreme-mass-ratio inspirals, as needed for the future space-based LISA gravitational wave detector.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑