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Late times dark energy transitions at redshifts $z \ll 0.1$ can raise thepredicted value of the Hubble constant to the SH0ES value, $74.03\pm 1.42$ (kms$^{-1}$ Mpc$^{-1})$ or more, while providing an equally good fit as$\Lambda$CDM at $67.73 \pm 0.41$ to higher redshift data, in particular fromthe cosmic microwave background and baryon acoustic oscillations. These modelshowever do not fully resolve the true source of tension between the distanceladder and high redshift observations: the local calibration of supernovaeluminosities well out into the Hubble flow. When tested in this manner bytransferring the SH0ES calibration to the Pantheon supernovae dataset, theability of such transitions to raise the Hubble constant is reduced to $69.17\pm 1.09$. Such an analysis should also be used when testing any dynamical darkenergy model which can produce similarly fine features in redshift or localvoid models.

Can Late Dark Energy Transitions Raise the Hubble constant?