Using simulated Tianqin gravitational wave data and electromagnetic wave data to study the coincidence problem and Hubble tension problem*

Abstract

Abstract In this study, we used electromagnetic wave data (H0LiCOW, , SNe) and gravitational wave data (Tianqin) to constrain the interacting dark energy (IDE) model and investigate the Hubble tension and coincidence problems. By combining these four types of data (Tianqin+H0LiCOW+SNe+ ), we obtained the following parameter values with a confidence interval of : , , , and . According to our results, the best value of shows that the Hubble tension problem can be alleviated to some extent. In addition, the center value of indicates that the coincidence problem is slightly alleviated. However, is still within the error range, which indicates that the ΛCDM model is still the model in best agreement with the observational data at present. Finally, we compared the constraint results of the electromagnetic and gravitational waves on the model parameters and found that the constraint effect of electromagnetic wave data on model parameters is better than that of simulated Tianqin gravitational wave data.