A forecast that SKA 21-cm redshift drift observations could constrain CPL dark-energy parameters, but the claimed sub-cm/s constraints are not actual parameter errors because the paper reports signal derivatives instead of propagated uncertainties.
Cool Outflows and HI absorbers with SKA
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abstract
HI 21-cm absorption spectroscopy provides a unique probe of the cold neutral gas in normal and active galaxies from redshift z > 6 to the present day. We describe the status of HI absorption studies, the plans for pathfinders/precursors, the expected breakthroughs that will be possible with SKA1, and some limitations set by the current design.
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Estimating constraints on cosmological parameters via the canonical and the differential redshift drift with SKA HI 21-cm observations
A forecast that SKA 21-cm redshift drift observations could constrain CPL dark-energy parameters, but the claimed sub-cm/s constraints are not actual parameter errors because the paper reports signal derivatives instead of propagated uncertainties.