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Abstract / Description of output
We provide perturbation theory predictions for the H i intensity mapping power spectrum multipoles using the Effective Field Theory of Large Scale Structure, which should allow us to exploit mildly non-linear scales. Assuming survey specifications typical of proposed interferometric H i intensity mapping experiments like Canadian Hydrogen Observatory and Radio transient Detector and PUMA, and realistic ranges of validity for the perturbation theory modelling, we run mock full shape Markov chain Monte Carlo (MCMC) analyses at z = 0.5, and compare with Stage-IV optical galaxy surveys. We include the impact of 21cm foreground removal using simulations-based prescriptions, and quantify the effects on the precision and accuracy of the parameter estimation. We vary 11 parameters in total: three cosmological parameters, seven bias and counter terms parameters, and the H i brightness temperature. Amongst them, the four parameters of interest are: the cold dark matter density, ωc, the Hubble parameter, h, the primordial amplitude of the power spectrum, As, and the linear H i bias, b1. For the best-case scenario, we obtain unbiased constraints on all parameters with
Original language | English |
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Pages (from-to) | 6246-6256 |
Number of pages | 11 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 519 |
Issue number | 4 |
Early online date | 12 Jan 2023 |
DOIs | |
Publication status | Published - 1 Mar 2023 |
Keywords / Materials (for Non-textual outputs)
- (cosmology:) large-scale structure of Universe
- cosmology: observations
- cosmology: theory
- methods: statistical
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