The Taiji Program in Space for gravitational wave physics and the nature of gravity

TLDR: Wang et al. as mentioned in this paper proposed a pre-study of space-based GW detection referred to as the Taiji Program in Space (TPIN) for the early universe and the nature of gravity.

Abstract: The discovery of gravitational waves (GWs) by the LIGO collaboration [1] in 2016 has provided a direct test on the prediction made by Albert Einstein a century ago based on his general theory of relativity [2]. It has caused a significant influence worldwide on the basic research in science. Space-based GW detection has become the next interesting target for the further study on the gravitational universe as space-based GW detection would reach a wider range of gravitational radiation sources than the ground-based GW detection can [3]. After the LISA/eLISA strategic plan [4] on space-based GW detection was put forward in the 1990s, Chinese scientists also showed their interest and began to make proposals for space-based GW detection in the 2000s. Recently, the Chinese Academy of Sciences (CAS) has set up a strategic priority research program that includes the pre-study of space-based GW detection referred to as the ‘Taiji Program in Space’ [5]. GWs are expected to provide a new window to explore the evolution of early universe and the nature of gravity. Though spaceand ground-based GW detectors adopt the same detecting