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arXiv 0705.2519gr-qc
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小质量比并合黑洞双星的忠实连续一体波形

Faithful Effective-One-Body waveforms of small-mass-ratio coalescing black-hole binaries

Thibault Damour, Alessandro Nagar

摘要:

我们解决的问题,构建高精度,忠实的分析波形描述的引力波信号所发出的吸气和合并的二元黑洞。我们的连续一体化(EOB)框架内工作,并提出了一种方法,用于改善当前(波形)实现这个框架的基础上的理解,元素的元素,每个特征的波形背后的物理,并系统地比较各种基于EOB的波形与“精确”的波形通过数值相对论方法获得。本文主要研究小质量比非自旋二元系统,这类系统可以方便地用Regge-Wheeler-Zerilli-type方法研究。我们的成果包括:(i)螺旋形波形的图解的、3 PN精确的描述,(ii)倾伏期间辐射反应的更好描述,(iii)倾伏波形的精细解析表达式,(iv)倾伏波形和衰荡波形之间匹配的改进处理。这种改进的EOB方法的实施,使我们能够构建完整的分析波形表现出显着的协议与“确切”的模量,频率和相位。特别地,在整个过程期间,在周期的$\pm 1.1 %$内,解析波形和数值波形保持同相。我们期望,我们的方法的扩展到可比质量的情况下,将能够产生直接用于地面网络的引力波干涉探测器的高精度的分析波形。

英文摘要:

We address the problem of constructing high-accuracy, faithful analytic waveforms describing the gravitational wave signal emitted by inspiralling and coalescing binary black holes. We work within the Effective-One-Body (EOB) framework and propose a methodology for improving the current (waveform)implementations of this framework based on understanding, element by element, the physics behind each feature of the waveform, and on systematically comparing various EOB-based waveforms with ``exact'' waveforms obtained by numerical relativity approaches. The present paper focuses on small-mass-ratio non-spinning binary systems, which can be conveniently studied by Regge-Wheeler-Zerilli-type methods. Our results include: (i) a resummed, 3PN-accurate description of the inspiral waveform, (ii) a better description of radiation reaction during the plunge, (iii) a refined analytic expression for the plunge waveform, (iv) an improved treatment of the matching between the plunge and ring-down waveforms. This improved implementation of the EOB approach allows us to construct complete analytic waveforms which exhibit a remarkable agreement with the ``exact'' ones in modulus, frequency and phase. In particular, the analytic and numerical waveforms stay in phase, during the whole process, within $\pm 1.1 %$ of a cycle. We expect that the extension of our methodology to the comparable-mass case will be able to generate comparably accurate analytic waveforms of direct use for the ground-based network of interferometric detectors of gravitational waves.

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