Degeneracy of gravitational waveforms in the context of GW150914

被引：4
|
作者：
Creswell, James [1 ,2 ]
Liu, Hao [1 ,2 ,3 ]
Jackson, Andrew D. [4 ]
von Hausegger, Sebastian [1 ,2 ]
Naselsky, Pavel [1 ,2 ]
机构：
[1] Univ Copenhagen, Niels Bohr Inst, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
[2] Univ Copenhagen, Discovery Ctr, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
[3] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle & Astrophys, 19B YuQuan Rd, Beijing, Peoples R China
[4] Univ Copenhagen, Niels Bohr Int Acad, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
来源：
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2018年 / 03期
基金：
新加坡国家研究基金会; 美国国家科学基金会;
关键词：
gravitational waves; experiments; sources; theory;
D O I：
10.1088/1475-7516/2018/03/007
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study the degeneracy of theoretical gravitational waveforms for binary black hole mergers using an aligned-spin effective-one-body model. After appropriate truncation, bandpassing, and matching, we identify regions in the mass spin parameter space containing waveforms similar to the template proposed for GW150914, with masses m(1) = 36(-4)(+5)M(circle dot) and m(2) = 29(-4)(+4)M(circle dot), using the cross-correlation coefficient as a measure of the similarity between waveforms. Remarkably high cross-correlations are found across broad regions of parameter space. The associated uncertanties exceed these from LIGO's Bayesian analysis considerably. We have shown that waveforms with greatly increased masses, such as m1 = 70M(circle dot) and m(2) = 35M(circle dot), and strong anti-aligned spins (x1 = 0.95 and x2 = 0.95) yield almost the same signal-to-noise ratio in the strain data for GW150914.
引用
收藏
页数：18
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