High-precision Measurements of Cosmic Curvature from Gravitational Wave and Cosmic Chronometer Observations  

作　　者：Yuan He Yu Pan Dong-Ping Shi Jin Li Shuo Cao Wei Cheng 

机构地区：[1]School of Science,Chongqing University of Posts and Telecommunications,Chongqing 400065,China [2]School of Electronic and Electrical Engineering,Chongqing University of Arts and Sciences,Chongqing 402160,China [3]Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics,Chongqing University,Chongqing 401331,China [4]Department of Astronomy,Beijing Normal University,Beijing 100875,China

出　　处：《Research in Astronomy and Astrophysics》2022年第8期198-205,共8页天文和天体物理学研究（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.12105032,11873001,12047564,12075041 and 12147102);the Fundamental Research Funds for the Central Universities of China(Grant Nos.2021CDJQY-011 and 2020CDJQY-Z003);the Science Foundation of Chongqing(Grant No.D63012022005);Chongqing Science and Technology research project(Grant No.KJ111206);the Natural Science Foundation of Chongqing(Grant No.cstc2021jcyj-msxm X0481);the Scientific Research and Innovation Project of Graduate Students in Chongqing(Grant No.CYS20272)。

摘　　要：Although the spatial curvature has been measured with very high precision,it still suffers from the well-known cosmic curvature tension.In this paper,we use an improved method to determine the cosmic curvature,by using the simulated data of binary neutron star mergers observed by the second generation space-based DECi-hertz Interferometer Gravitational-wave Observatory(DECIGO).By applying the Hubble parameter observations of cosmic chronometers to the DECIGO standard sirens,we explore different possibilities of making measurements of the cosmic curvature referring to a distant past:one is to reconstruct the Hubble parameters through the Gaussian process without the influence of hypothetical models,and the other is deriving constraints onΩKin the framework of the non-flatΛcold dark matter model.It is shown that in the improved method DECIGO could provide a reliable and stringent constraint on the cosmic curvature(ΩK=-0.007±0.016),while we could only expect the zero cosmic curvature to be established at the precision ofΔΩK=0.11 in the second model-dependent method.Therefore,our results indicate that in the framework of methodology proposed in this paper,the increasing number of well-measured standard sirens in DECIGO could significantly reduce the bias of estimations for cosmic curvature.Such a constraint is also comparable to the precision of Planck 2018 results with the newest cosmic microwave background(CMB)observations(ΔΩK≈0.018),based on the concordanceΛCDM model.

关 键 词：(cosmology:)cosmological parameters gravitational waves cosmology:observations 

分 类 号：P112[天文地球—天文学] P159