We use the results of previous work building a halo model formalism for the distribution of neutral hydrogen, along with experimental parameters of future radio facilities, to place forecasts on astrophysical and cosmological parameters from next generation surveys. We consider 21 cm intensity mapping surveys conducted using the BINGO, CHIME, FAST, TianLai, MeerKAT and SKA experimental configurations. We work with the 5-parameter cosmological dataset of {$\Omega_m, \sigma_8, h, n_s, \Omega_b$} assuming a flat $\Lambda$CDM model, and the astrophysical parameters {$v_{c,0}, \beta$} which represent the cutoff and slope of the HI- halo mass relation. We explore (i) quantifying the effects of the astrophysics on the recovery of the cosmological parameters, (ii) the dependence of the cosmological forecasts on the details of the astrophysical parametrization, and (iii) the improvement of the constraints on probing smaller scales in the HI power spectrum. For an SKA I MID intensity mapping survey alone, probing scales up to $\ell_{\rm max} = 1000$, we find a factor of $1.1 - 1.3$ broadening in the constraints on $\Omega_b$ and $\Omega_m$, and of $2.4 - 2.6$ on $h$, $n_s$ and $\sigma_8$, if we marginalize over astrophysical parameters without any priors. However, even the prior information coming from the present knowledge of the astrophysics largely alleviates this broadening. These findings do not change significantly on considering an extended HIHM relation, illustrating the robustness of the results to the choice of the astrophysical parametrization. Probing scales up to $\ell_{\rm max} = 2000$ improves the constraints by factors of 1.5-1.8. The forecasts improve on increasing the number of tomographic redshift bins, saturating, in many cases, with 4 - 5 redshift bins. We also forecast constraints for intensity mapping with other experiments, and draw similar conclusions.
翻译:我们利用先前的工作成果,建立中性氢的光度模型正规化,以及未来无线电设施的实验参数,对下一代调查中的天体物理和宇宙参数进行预测。我们考虑利用BINGO、CHIME、FAST、TianLai、MeerKAT和SKA等实验配置进行21厘米的强度绘图调查。我们与5参数的宇宙数据集合作,{Omega_m,\sigma_8,h,n_s,\mega_b$b$的模型,假设一个平价的Lambda$ CDM模型,以及天体物理参数参数参数参数参数参数参数参数参数的预测。我们考虑21厘米的强度测量值测量值的深度测量值和斜度的深度测量值。我们从现在的深度测量值的深度测量值增长到现在的深度测量值。