Measuring properties of primordial black hole mergers at cosmological distances: Effect of higher order modes in gravitational waves
Measuring properties of primordial black hole mergers at cosmological distances: Effect of higher order modes in gravitational waves
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DOI：
10.1103/physrevd.107.024041
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发表时间：
2022-10
影响因子：
5
通讯作者：
K. Ng;B. Goncharov;Shi-yong Chen;S. Borhanian;U. Dupletsa;G. Franciolini;M. Branchesi;J. Harms;M. Maggiore;A. Riotto;B. Sathyaprakash;S. Vitale
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文献类型：
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作者：
K. Ng;B. Goncharov;Shi-yong Chen;S. Borhanian;U. Dupletsa;G. Franciolini;M. Branchesi;J. Harms;M. Maggiore;A. Riotto;B. Sathyaprakash;S. Vitale
原始黑洞(PBH)可能是在大爆炸后不久物质超密度坍塌而形成的。人们可以通过观测在高红移的PBH双星合并时发出的引力波(GW)来识别它们的存在，在那里天体物理双星黑洞(BBH)不太可能合并。下一代地面GW探测器，宇宙探索者和爱因斯坦望远镜，将能够在这样的红移下观测到总质量为数学式{O}(10-100)~M_(\ODOT)$的BBH。本文作为ARXIV：2108.07276的补充文件，重点研究了波形建模中的高阶模式(HOMS)对源参数估计的影响。对于这些高红移的BBH，高阶模式是可以检测到的。我们进行贝叶斯参数估计，以获得由下一代GW探测器网络观测到的具有不同总质量、质量比、轨道倾角和红移的源在波形中有无HOM建模的测量不确定度。我们表明，在波形模型中包含HOMS可以将红移和质量的不确定性降低到原来的两倍，这取决于确切的源参数。然后，我们讨论了用改进的单粒子测量来识别PBH的意义，并扩展了对起源于第一恒星的BBH合并和原始BBH合并之间相对丰度的模型依赖性的研究，如arxiv：2108.07276所示。
Primordial black holes (PBHs) may form from the collapse of matter overdensities shortly after the Big Bang. One may identify their existence by observing gravitational wave (GW) emissions from merging PBH binaries at high redshifts $z\gtrsim 30$, where astrophysical binary black holes (BBHs) are unlikely to merge. The next-generation ground-based GW detectors, Cosmic Explorer and Einstein Telescope, will be able to observe BBHs with total masses of $\mathcal{O}(10-100)~M_{\odot}$ at such redshifts. This paper serves as a companion paper of arXiv:2108.07276, focusing on the effect of higher-order modes (HoMs) in the waveform modeling, which may be detectable for these high redshift BBHs, on the estimation of source parameters. We perform Bayesian parameter estimation to obtain the measurement uncertainties with and without HoM modeling in the waveform for sources with different total masses, mass ratios, orbital inclinations and redshifts observed by a network of next-generation GW detectors. We show that including HoMs in the waveform model reduces the uncertainties of redshifts and masses by up to a factor of two, depending on the exact source parameters. We then discuss the implications for identifying PBHs with the improved single-event measurements, and expand the investigation of the model dependence of the relative abundance between the BBH mergers originating from the first stars and the primordial BBH mergers as shown in arXiv:2108.07276.