Taiji-TianQin-LISA network:Precisely measuring the Hubble constant using both bright and dark sirens  

作　　者：Shang-Jie Jin Ye-Zhu Zhang Ji-Yu Song Jing-Fei Zhang Xin Zhang 

机构地区：[1]Key Laboratory of Cosmology and Astrophysics(Liaoning)&College of Sciences,Northeastern University,Shenyang 110819,China [2]Key Laboratory of Data Analytics and Optimization for Smart Industry(Ministry of Education),Northeastern University,Shenyang 110819,China [3]National Frontiers Science Center for Industrial Intelligence and Systems Optimization,Northeastern University,Shenyang 110819,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第2期59-77,共19页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National SKA Program of China(Grant Nos.2022SKA0110200,and 2022SKA0110203);the National Natural Science Foundation of China(Grant Nos.11975072,11875102,and 11835009);the National 111 Project(Grant No.B16009);the Fundamental Research Funds for the Central Universities(Grant No.N232410019)。

摘　　要：In the coming decades,the space-based gravitational-wave(GW)detectors such as Taiji,TianQin,and LISA are expected to form a network capable of detecting millihertz GWs emitted by the mergers of massive black hole binaries(MBHBs).In this work,we investigate the potential of GW standard sirens from the Taiji-TianQin-LISA network in constraining cosmological parameters.For the optimistic scenario in which electromagnetic(EM)counterparts can be detected,we predict the number of detectable bright sirens based on three different MBHB population models,i.e.,popⅢ,Q3d,and Q3nod.Our results show that the TaijiTianQin-LISA network alone could achieve a constraint precision of 0.9%for the Hubble constant,meeting the standard of precision cosmology.Moreover,the Taiji-TianQin-LISA network could effectively break the cosmological parameter degeneracies generated by the CMB data,particularly in the dynamical dark energy models.When combined with the CMB data,the joint CMB+Taiji-TianQin-LISA data offerσ(w)=0.036 in the wCDM model,which is close to the latest constraint result obtained from the CMB+SN data.We also consider a conservative scenario in which EM counterparts are not available.Due to the precise sky localizations of MBHBs by the Taiji-TianQin-LISA network,the constraint precision of the Hubble constant is expected to reach 1.2%.In conclusion,the GW standard sirens from the Taiji-TianQin-LISA network will play a critical role in helping solve the Hubble tension and shedding light on the nature of dark energy.

关 键 词：space-based gravitational wave detection standard sirens the Taiji-TianQin-LISA network the Hubble constant dark energy 

分 类 号：P142.84[天文地球—天体物理]