We present a determination of the Hubble constant from the joint, free-form analysis of 8 strongly, quadruply lensing systems. In the concordance cosmology, we find H0=71.8−3.3+3.9kms−1Mpc−1 with a precision of 4.97%. This is in agreement with the latest measurements from Supernovae Type Ia and Planck observations of the cosmic microwave background. Our precision is lower compared to these and other recent time-delay cosmography determinations, because our modelling strategies reflect the systematic uncertainties of lensing degeneracies. We furthermore are able to find reasonable lensed image reconstructions by constraining to either value of H0 from local and early Universe measurements. This leads us to conclude that current lensing constraints on H0 are not strong enough to break the "Hubble tension" problem of cosmology.
@article{arxiv.2007.14398,
title = {The Hubble constant from eight time-delay galaxy lenses},
author = {Philipp Denzel and Jonathan P. Coles and Prasenjit Saha and Liliya L. R. Williams},
journal= {arXiv preprint arXiv:2007.14398},
year = {2021}
}