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.
arXiv:2409.09977
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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.