Hubble Parameter Estimation Via Dark Sirens with the LISA-Taiji Network

Renjie Wang,Wen-Hong Ruan,Qing Yang,Zong-Kuan Guo,Rong-Gen Cai,Bin Hu

National Science Review（2021）SCI 1区

Beijing Normal Univ | Chinese Acad Sci | Shenzhen Technol Univ

Cited 25|Views27

Abstract

The Hubble parameter is one of the central parameters in modern cosmology, and describes the present expansion rate of the universe. The values of the parameter inferred from late-time observations are systematically higher than those inferred from early-time measurements by about 10%. To reach a robust conclusion, independent probes with accuracy at percent levels are crucial. Gravitational waves from compact binary coalescence events can be formulated into the standard siren approach to provide an independent Hubble parameter measurement. The future space-borne gravitational wave observatory network, such as the LISA-Taiji network, will be able to measure the gravitational wave signals in the millihertz bands with unprecedented accuracy. By including several statistical and instrumental noises, we show that, within a five-year operation time, the LISA-Taiji network is able to constrain the Hubble parameter within 1% accuracy, and possibly beats the scatters down to 0.5% or even better.

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Key words

gravitational waves,Hubble parameter,super massive black hole

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