Computing fast and reliable gravitational waveforms of binary neutron star merger remnants

被引：28

作者：

Easter, Paul J. ^{[1
,2
]}

Lasky, Paul D. ^{[1
,2
]}

Casey, Andrew R. ^{[1
,2
,3
]}

Rezzolla, Luciano ^{[4
]}

Takami, Kentaro ^{[5
]}

机构：

[1] Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia

[2] OzGrav ARC Ctr Excellence Gravitat Wave Discovery, Clayton, Vic 3800, Australia

[3] Monash Univ, Fac Informat Technol, Clayton, Vic 3800, Australia

[4] Inst Theoret Phys, Max von Laue Str 1, D-60438 Frankfurt, Germany

[5] Kobe City Coll Technol, Kobe, Hyogo 6512194, Japan

来源：

PHYSICAL REVIEW D | 2019年 / 100卷 / 04期

基金：

澳大利亚研究理事会;

关键词：

D O I：

10.1103/PhysRevD.100.043005

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Gravitational waves have been detected from the inspiral of a binary neutron-star, GW170817, which allowed constraints to be placed on the neutron star equation of state. The equation of state can be further constrained if gravitational waves from a postmerger remnant are detected. Postmerger waveforms are currently generated by numerical-relativity simulations, which are computationally expensive. Here we introduce a hierarchical model trained on numerical-relativity simulations, which can generate reliable postmerger spectra in a fraction of a second. Our spectra have mean fitting factors of 0.95, which compares to a fitting factor of 0.93 between different numerical-relativity codes that simulate the same physical system. This method is the first step towards generating large template banks of spectra for use in postmerger detection and parameter estimation.

引用

页数：7

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