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HI and cosmological constraints from intensity mapping, optical, and CMB surveys
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We forecast constraints on neutral hydrogen (HI) and cosmological parameters using near-term intensity mapping surveys with instruments such as BINGO, MeerKAT, and the SKA, and Stage III and IV optical galaxy surveys. If foregrounds and systematic effects can be controlled - a problem which becomes much easier in cross-correlation - these surveys will provide exquisite measurements of the HI density and bias, as well as measurements of the growth of structure, the angular diameter distance, and the Hubble rate, over a wide range of redshift. We also investigate the possibility of detecting the late time ISW effect using the Planck satellite and forthcoming intensity mapping surveys, finding that a large sky survey with Phase 1 of the SKA can achieve a near optimal detection.
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Cited by 2 Pith papers
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Cosmology from Nx2pt Analyses of SKAO Wide-Area Surveys
SKA-Mid AA4 N×2pt combinations of continuum and HI surveys are forecast to deliver ~1% precision on ΛCDM parameters and useful constraints on w0–wa, Mν and Ωk.
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Cosmology with HI Intensity Mapping
SKAO HI intensity mapping forecasts yield competitive LambdaCDM constraints (e.g. H0 to ~0.3 km/s/Mpc optimistic) via power spectrum, BAO, bispectrum and stacking, complementary to CMB and optical surveys.
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