Using simulated Tianqin gravitational wave data and electromagnetic wave data to study the coincidence problem and Hubble tension problem by JiaWei Zhang et al. on Wednesday 30 November

In this paper, we use electromagnetic wave data (H0LiCOW, $H(z)$, SNe) and

gravitational wave data (Tianqin) to constrain the interacting dark energy

(IDE) model and investigate the Hubble tension problem and coincidences

problem. By combining these four kinds of data (Tianqin+H0LiCOW+SNe+$H(z)$), we

obtained the parameter values at the confidence interval of $1\sigma$:

$\Omega_m=0.36\pm0.18$, $\omega_x=-1.29^{+0.61}_{-0.23}$,

$\xi=3.15^{+0.36}_{-1.1}$, and $H_0=70.04\pm0.42$ $kms^{-1}Mpc^{-1}$. According

to our results, the best valve of $H_0$ show that the Hubble tension problem

can be alleviated to some extent. In addition, the $\xi+3\omega_x =

-0.72^{+2.19}_{-1.19}(1\sigma)$ of which the center value indicates the

coincidence problem is slightly alleviated. However, the $\xi+3\omega_x = 0$ is

still within the $1\sigma$ error range which indicates the $\Lambda$CDM model

is still the model which is in best agreement with the observational data at

present. Finally, we compare the constraint results of electromagnetic wave and

gravitational wave on the model parameters and find that the constraint effect

of electromagnetic wave data on model parameters is better than that of

simulated Tianqin gravitational wave data.

arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.16979v1