The Hubble Constant determined through an inverse distance ladder including quasar time delays and Type Ia supernovae
arXiv:1905.12496 · doi:10.1051/0004-6361/201935980
Abstract
Context. The precise determination of the present-day expansion rate of the Universe, expressed through the Hubble constant , is one of the most pressing challenges in modern cosmology. Assuming flat CDM, inference at high redshift using cosmic-microwave-background data from Planck disagrees at the 4.4 level with measurements based on the local distance ladder made up of parallaxes, Cepheids and Type Ia supernovae (SNe Ia), often referred to as "Hubble tension". Independent, cosmological-model-insensitive ways to infer are of critical importance. Aims. We apply an inverse-distance-ladder approach, combining strong-lensing time-delay-distance measurements with SN Ia data. By themselves, SNe Ia are merely good relative distance indicators, but by anchoring them to strong gravitational lenses one can obtain an measurement that is relatively insensitive to other cosmological parameters. Methods. A cosmological parameter estimate is performed for different cosmological background models, both for strong-lensing data alone and for the combined lensing + SNe Ia data sets. Results. The cosmological-model dependence of strong-lensing measurements is significantly mitigated through the inverse distance ladder. In combination with SN Ia data, the inferred consistently lies around 73-74 km s Mpc, regardless of the assumed cosmological background model. Our results agree nicely with those from the local distance ladder, but there is a >2 tension with Planck results, and a ~1.5 discrepancy with results from an inverse distance ladder including Planck, Baryon Acoustic Oscillations and SNe Ia. Future strong-lensing distance measurements will reduce the uncertainties in from our inverse distance ladder.
arXiv comment5 pages, 3 figures, A&A letters accepted version
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