Recent measurements of the Hubble constant using type Ia supernovae explicitly correct for their estimated peculiar velocities using the 2M++ reconstruction of the local density field. The amount of uncertainty from this reconstruction procedure has thus far been unquantified. To rectify this, we use mock universe realisations of the 2M++ catalogue and generate predicted peculiar velocities using the same method as the predictions that are used to correct for the Pantheon+ catalogue. We find that the method yields uncertainties of 0.3 km/s/Mpc and hence subdominant to the total uncertainty in H0.
@article{arxiv.2501.15704,
title = {Uncertainties in the Hubble Constant from Peculiar Velocities},
author = {Amber M. Hollinger and Michael J. Hudson},
journal= {arXiv preprint arXiv:2501.15704},
year = {2025}
}