Abstract
In this perspective, we outline that a space borne gravitational wave detector network combining LISA and Taiji can be used to measure the Hubble constant with an uncertainty less than 0.5% in ten years, compared with the network of the ground based gravitational wave detectors which can measure the Hubble constant within a 2% uncertainty in the next five years by the standard siren method. Taiji is a Chinese space borne gravitational wave detection mission planned for launch in the early 2030 s. The pilot satellite mission Taiji-1 has been launched in August 2019 to verify the feasibility of Taiji. The results of a few technologies tested on Taiji-1 are presented in this paper.
Highlights
In this perspective, we outline that a space borne gravitational wave detector network combining LISA and Taiji can be used to measure the Hubble constant with an uncertainty less than 0.5% in ten years, compared with the network of the ground based gravitational wave detectors which can measure the Hubble constant within a 2% uncertainty in the five years by the standard siren method
We discuss a method to further improve the fractional uncertainty of the Hubble constant to a precision
The improvement comes from that a space-borne GW antenna such LISA8,9 and Taiji[10–13] can avoid the degeneracy problem because of its orbital motion[14] and the precision of a GW source’s position and its luminosity distance can be improved by 2–3 orders of magnitude by the LISA–Taiji network[15], compared to the individual antenna such as LISA or Taiji
Summary
1234567890():,; In this perspective, we outline that a space borne gravitational wave detector network combining LISA and Taiji can be used to measure the Hubble constant with an uncertainty less than 0.5% in ten years, compared with the network of the ground based gravitational wave detectors which can measure the Hubble constant within a 2% uncertainty in the five years by the standard siren method. The improvement comes from that a space-borne GW antenna such LISA8,9 and Taiji[10–13] can avoid the degeneracy problem because of its orbital motion[14] and the precision of a GW source’s position and its luminosity distance can be improved by 2–3 orders of magnitude by the LISA–Taiji network[15], compared to the individual antenna such as LISA or Taiji. It requires a 1-year overlap of LISA and Taiji missions to achieve this precision. We will report the main results of the payload test for Taiji-1
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