Testing the spatial geometry of the universe with TianQin: the prospect of using supermassive black hole binaries

Understand

The determination of the spatial geometry of the universe plays an important role in modern cosmology.

• Any deviation from the cosmic curvature $\Omega_K=0$ would have a profound impact on the primordial inflation paradigm and fundamental physics.
• In this paper, we carry out a systematic study of the prospect of measuring cosmic curvature with the inspiral signal of supermassive black hole binaries (SMBHBs) that could be detected with TianQin.
• The study is based on a cosmological-model-independent method that extended the application of gravitational wave (GW) standard sirens in cosmology.