Estimating cosmological parameters by the simulated data of gravitational waves from the Einstein Telescope

doi:http://dx.doi.org/10.1103/PhysRevD.95.044024

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	Estimating cosmological parameters by the simulated data of gravitational waves from the Einstein Telescope
	Yang, T; Cai, RG; Yang, T (reprint author), Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, POB 2735, Beijing 100190, Peoples R China.
刊名	PHYSICAL REVIEW D
	2017
卷号	95 期号:4 页码:44024
DOI	http://dx.doi.org/10.1103/PhysRevD.95.044024
英文摘要	We investigate the constraint ability of the gravitational wave (GW) as the standard siren on the cosmological parameters by using the third-generation gravitational wave detector: the Einstein Telescope. The binary merger of a neutron with either a neutron or black hole is hypothesized to be the progenitor of a short and intense burst of gamma rays; some fraction of those binary mergers could be detected both through electromagnetic radiation and gravitational waves. Thus we can determine both the luminosity distance and redshift of the source separately. We simulate the luminosity distances and redshift measurements from 100 to 1000 GWevents. We use two different algorithms to constrain the cosmological parameters. For the Hubble constant H-0 and dark matter density parameter Omega(m), we adopt the Markov chain Monte Carlo approach. We find that with about 500-600 GW events we can constrain the Hubble constant with an accuracy comparable to Planck temperature data and Planck lensing combined results, while for the dark matter density, GWs alone seem not able to provide the constraints as good as for the Hubble constant; the sensitivity of 1000 GWevents is a little lower than that of Planck data. It should require more than 1000 events to match the Planck sensitivity. Yet, for analyzing the more complex dynamical property of dark energy, i. e., the equation of state w, we adopt a new powerful nonparametric method: the Gaussian process. We can reconstruct w directly from the observational luminosity distance at every redshift. In the low redshift region, we find that about 700 GW events can give the constraints of w(z)comparable to the constraints of a constant w by Planck data with type-Ia supernovae. Those results show that GWs as the standard sirens to probe the cosmological parameters can provide an independent and complementary alternative to current experiments.
学科主题	Astronomy & Astrophysics ; Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/22123]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Cai, RG; Yang, T (reprint author), Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, POB 2735, Beijing 100190, Peoples R China.
推荐引用方式 GB/T 7714	Yang, T,Cai, RG,Yang, T . Estimating cosmological parameters by the simulated data of gravitational waves from the Einstein Telescope[J]. PHYSICAL REVIEW D,2017,95(4):44024.
APA	Yang, T,Cai, RG,&Yang, T .(2017).Estimating cosmological parameters by the simulated data of gravitational waves from the Einstein Telescope.PHYSICAL REVIEW D,95(4),44024.
MLA	Yang, T,et al."Estimating cosmological parameters by the simulated data of gravitational waves from the Einstein Telescope".PHYSICAL REVIEW D 95.4(2017):44024.