Interferometric H <scp>i</scp> intensity mapping: perturbation theory predictions and foreground removal effects

ABSTRACT We provide perturbation theory predictions for the H i intensity mapping power spectrum multipoles using Effective Field Theory of Large Scale Structure, which should allow us to exploit mildly non-linear scales. Assuming survey specifications typical proposed interferometric experiments like Canadian Hydrogen Observatory and Radio transient Detector PUMA, realistic ranges validity modelling, we run mock full shape Markov chain Monte Carlo (MCMC) analyses at z = 0.5, compare with Stage-IV optical galaxy surveys. include impact 21cm foreground removal simulations-based prescriptions, quantify effects on precision accuracy parameter estimation. vary 11 parameters in total: three cosmological parameters, seven bias counter terms brightness temperature. Amongst them, four interest are: cold dark matter density, ?c, Hubble parameter, h, primordial amplitude spectrum, As, linear bias, b1. For best-case scenario, obtain unbiased constraints all $\lt 3{{\ \rm per\ cent}}$ errors $68{{\ confidence level. When effects, estimation becomes strongly biased b1, while As is less (&amp;lt;2?). find that scale cuts $k_{\rm min} \ge 0.03 \ h\,\mathrm{Mpc}^{-1}$ are required return accurate estimates ?c price a decrease precision, b1 remains biased. comment implications these results real data analyses.