Elucidating cosmological model dependence with $H_0$

Abstract

We observe that the errors on the Hubble constant $H_0$, a universal parameter in any FLRW cosmology, can be larger in specific cosmological models than Gaussian Processes (GP) data reconstruction. We comment on the prior mean function and trace the smaller GP errors to stronger correlations, which we show precludes all well studied dynamical dark energy models. Our analysis suggests that "cosmological model independence", especially in the statement of Hubble tension, has become a misnomer.

v3: 9 pages, 3 figures, Drastically reduced in size, arguments and statements sharpened, the main conclusions and results unchanged