Late-time cosmology with 21cm intensity mapping experiments
We present a framework for forecasting cosmological constraints from future neutral hydrogen intensity mapping experiments at low to intermediate redshifts. In the process, we establish a simple way of comparing such surveys with optical galaxy redshift surveys. We explore a wide range of experimental configurations and assess how well a number of cosmological observables (the expansion rate, growth rate, and angular diameter distance) and parameters (the densities of dark energy and dark mat...Expand abstract
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36 pages, 30 figures. For the busy reader: See Section VIII, Figs.
19/28, and Table IV