Prospects for Constraining Interacting Dark Energy Models with 21 cm Intensity Mapping Experiments

We forecast constraints on cosmological parameters in the interacting dark energy models using mock data generated for neutral hydrogen intensity mapping (IM) experiments. In this work, we only consider with transfer rate $Q=\beta H\rho_{\rm c}$, and take BINGO, FAST, SKA1-MID, Tianlai as typical examples of 21 cm IM find that cylinder array will play an important role constraining model. Assuming perfect foreground removal calibration, Tianlai-alone data, obtain $\sigma(H_0)=0.19$ km s$^{-1}$ Mpc$^{-1}$, $\sigma(\Omega_{\rm m})=0.0033$ $\sigma(\sigma_8)=0.0033$ I$\Lambda$CDM model, which are much better than results Planck+optical BAO (i.e. optical galaxy surveys). However, cannot provide a very tight constraint coupling parameter $\beta$ compared BAO, while Planck+Tianlai can give rather $\sigma(\beta)=0.00023$ due to degeneracies being well broken by combination. I$w$CDM $\sigma(\beta)=0.00079$ $\sigma(w)=0.013$ from Planck+Tianlai. addition, also make detailed comparison among models. show future experiments useful tool exploring nature significant measuring between matter.