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 usin...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.展开更多
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)+3 种基金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)。
文摘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.
