DOI: 10.1016/j.scib.2020.04.032
论文题名: Prospects for improving cosmological parameter estimation with gravitational-wave standard sirens from Taiji
作者: Zhao Z.-W. ; Wang L.-F. ; Zhang J.-F. ; Zhang X.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2020
卷: 65, 期: 16 起始页码: 1340
结束页码: 1348
语种: 英语
中文关键词: Cosmological parameter estimation
; Dark energy
; Space-based gravitational-wave observatory
; Standard sirens
; Taiji
英文关键词: Cosmic ray measurement
; Cosmology
; Gravitational effects
; Gravity waves
; Signaling
; Sirens
; Cosmic microwave backgrounds
; Cosmological models
; Cosmological parameters
; Cosmological probes
; Equilateral triangles
; Expansion of the universe
; Gravitational-wave observatory
; Massive black holes
; Parameter estimation
英文摘要: Taiji, a space-based gravitational-wave observatory, consists of three satellites forming an equilateral triangle with arm length of 3×106 km, orbiting around the Sun. Taiji is able to observe the gravitational-wave standard siren events of massive black hole binary (MBHB) merger, which is helpful in probing the expansion of the universe. In this paper, we preliminarily forecast the capability of Taiji for improving cosmological parameter estimation with the gravitational-wave standard siren data. We simulate five-year standard siren data based on three fiducial cosmological models and three models of MBHB's formation and growth. It is found that the standard siren data from Taiji can effectively break the cosmological parameter degeneracies generated by the cosmic microwave background (CMB) anisotropies data, especially for dynamical dark energy models. The constraints on cosmological parameters are significantly improved by the data combination CMB + Taiji, compared to the CMB data alone. Compared to the current optical cosmological observations, Taiji can still provide help in improving the cosmological parameter estimation to some extent. In addition, we consider an ideal scenario to investigate the potential of Taiji on constraining cosmological parameters. We conclude that the standard sirens of MBHB from Taiji will become a powerful cosmological probe in the future. © 2020 Science China Press Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170175
Appears in Collections: 气候变化与战略
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作者单位: Department of Physics, College of Sciences, Northeastern University, Shenyang, 110819, China; Ministry of Education's Key Laboratory of Data Analytics and Optimization for Smart Industry, Northeastern University, Shenyang, 110819, China; Center for High Energy Physics, Peking University, Beijing, 100080, China
Recommended Citation:
Zhao Z.-W.,Wang L.-F.,Zhang J.-F.,et al. Prospects for improving cosmological parameter estimation with gravitational-wave standard sirens from Taiji[J]. Science Bulletin,2020-01-01,65(16)