Precisely measuring the Hubble constant and dark energy using only gravitational-wave dark sirens

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Shang-Jie Jin Tian-Nuo Li Jing-Fei Zhang Xin Zhang

摘要： Using the measurements of tidal deformations in the binary neutron star (BNS) coalescences can obtain the information of redshifts of gravitational wave (GW) sources, and thus actually the cosmic expansion history can be investigated by solely using such GW dark sirens. To do this, the key is to get large amounts of accurate GW data, which can be achieved by employing the third-generation (3G) GW detectors. In this paper, we wish to offer an answer to the question of whether the Hubble constant and the equation of state (EoS) of dark energy can be precisely measured by solely using GW dark sirens. We find that in the era of 3G GW detectors ${\cal O}(10^5)$-${\cal O}(10^6)$ dark siren data (with the tidal measurements) can be obtained in a several-year observation, and thus using only dark sirens can actually achieve the precision cosmology. Based on a network of 3G detectors, we obtain the constraint precisions of $0.1\%$ and $0.6\%$ for the Hubble constant $H_0$ and the constant EoS of dark energy $w$, respectively; for a two-parameter EoS parametrization of dark energy, the precision of $w_0$ is $1.4\%$ and the error of $w_a$ is 0.086. We conclude that 3G GW detectors would lead to breakthroughs in solving the Hubble tension and revealing the nature of dark energy.

同行评议状态:待评议

 点击量 14  下载量 11  评论