LATE-TIME COSMOLOGY WITH 21 cm INTENSITY MAPPING EXPERIMENTS

By P. Bull, Pedro G. Ferreira, P. Patel, Mário G. Santos. 2014

289 citations recorded by the source corpus.

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 matter, spatial curvature, the dark energy equation of state, etc.) will be measured by an extensive roster of upcoming experiments. A number of potential contaminants and systematic effects are also studied in detail. The overall picture is encouraging—if autocorrelation calibration can be controlled to a sufficient level, Phase I of the Square Kilometre Array should be able to constrain the dark energy equation of state about as well as a DETF Stage IV galaxy redshift survey like Euclid, in roughly the same time frame.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/bac6bc8b393017bd08be18041cc97617e9e721d5

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Citations in the corpus

Ingredients for 21 cm Intensity Mapping (2018, methodology): “A different way to trace the matter field is through 21cm intensity mapping (Bharadwaj et al. 2001; Bharadwaj & Sethi 2001; Battye et al. 2004; McQuinn et al. 2006; Chang et al. 2008; Loeb & Wyithe 2008; Bull et al. 2015; Santos et al. 2015; Villaescusa-Navarro et al. 2015).”
Probing primordial non-Gaussianity with SKA galaxy redshift surveys: a fully relativistic analysis (2014, background): “Large volumes, with redshift information, can in principle be delivered by a SKA1 HI intensity mapping survey (see e.g. Bull et al. 2014), but several technical issues still need to be addressed.”
Cosmology with Phase 1 of the Square Kilometre Array Red Book 2018: Technical specifications and performance forecasts (2018, methodology): “Simulations have found that almost all HI in the post-reionisation Universe resides within dark matter halos (Villaescusa-Navarro et al. 2014, 2018b).”