Constraining Cosmological Parameters in the FLRW Metric with Lensed GW+EM Signals
Li,Yufeng1,2; Fan,Xilong3,4; Gou,Lijun1,2
Source PublicationThe Astrophysical Journal
AbstractAbstract We proposed a model-independent method to constrain cosmological parameters using the Distance Sum Rule of the Friedmann–Lema?tre–Robertson–Walker metric by combining the time delay distances and the comoving distances through a multi-messenger approach. The time delay distances are measured from lensed gravitational wave?(GW) signals together with their corresponding electromagnetic wave?(EM) counterparts, while the comoving distances are obtained from a parameterized fitting approach with independent supernova observations. With a series of simulations based on the Einstein Telescope, Large Synoptic Survey Telescope, and The Dark Energy Survey, we find that only 10 lensed GW+EM systems can achieve the constraining power comparable to and even stronger than 300 lensed quasar systems due to the more precise time delay from lensed GW signals. Specifically, the cosmological parameters can be constrained to ? and ? (1σ).5 Our results show that more precise time delay measurements could provide more stringent cosmological parameter values, and lensed GW+EM systems therefore can be applied as a powerful tool in the future precision cosmology.
Keywordcosmological parameters gravitational lensing: strong gravitational waves
WOS IDIOP:0004-637X-873-1-ab037e
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China
2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
3.School of Physics and Technology, Wuhan University, Wuhan 430072, People’s Republic of China;
4.Department of Physics and Mechanical and Electrical Engineering, Hubei University of Education, Wuhan 430205, People’s Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
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Li,Yufeng,Fan,Xilong,Gou,Lijun. Constraining Cosmological Parameters in the FLRW Metric with Lensed GW+EM Signals[J]. The Astrophysical Journal,2019,873(1).
APA Li,Yufeng,Fan,Xilong,&Gou,Lijun.(2019).Constraining Cosmological Parameters in the FLRW Metric with Lensed GW+EM Signals.The Astrophysical Journal,873(1).
MLA Li,Yufeng,et al."Constraining Cosmological Parameters in the FLRW Metric with Lensed GW+EM Signals".The Astrophysical Journal 873.1(2019).
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