Black-hole hair loss: learning about binary progenitors from ringdown signals
Black-hole hair loss: learning about binary progenitors from ringdown signals
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DOI：
10.1103/physrevd.85.024018
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发表时间：
2011-07
影响因子：
5
通讯作者：
I. Kamaretsos;M. Hannam;S. Husa;B. Sathyaprakash
中科院分区：
文献类型：
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作者：
I. Kamaretsos;M. Hannam;S. Husa;B. Sathyaprakash
受扰动的克尔黑洞发出引力辐射，这种辐射（出于引力波天文学的实际目的）由被称为准正态模的阻尼正弦波的叠加组成。模式的频率和时间常数只取决于黑洞的质量和自旋——这是无毛定理的结果。有人提出，对两个或两个以上的准正态模的测量可以用来确认源是黑洞，并测试广义相对论在超强引力场中是否继续成立。本文提出了一种用拟正态模检验广义相对论的实用方法。我们还将论证，各种准正态模态的相对振幅编码了引起它们的扰动起源的重要信息。这有助于从对发射的准正态模的观测推断出扰动的性质。特别是，我们将证明在一对非自旋黑洞合并过程中发射的不同准正态模式的相对振幅可以用来测量祖先双星的组成质量。
Perturbed Kerr black holes emit gravitational radiation, which (for the practical purposes of gravitational-wave astronomy) consists of a superposition of damped sinusoids termed quasinormal modes. The frequencies and time constants of the modes depend only on the mass and spin of the black hole—a consequence of the no-hair theorem. It has been proposed that a measurement of two or more quasinormal modes could be used to confirm that the source is a black hole and to test if general relativity continues to hold in ultrastrong gravitational fields. In this paper, we propose a practical approach to testing general relativity with quasinormal modes. We will also argue that the relative amplitudes of the various quasinormal modes encode important information about the origin of the perturbation that caused them. This helps in inferring the nature of the perturbation from an observation of the emitted quasinormal modes. In particular, we will show that the relative amplitudes of the different quasinormal modes emitted in the process of the merger of a pair of nonspinning black holes can be used to measure the component masses of the progenitor binary.