Abstract We present a measurement of the Hubble constant (H0) and other cosmological parameters from a joint analysis of six gravitationally lensed quasars with measured time delays. All lenses except the first are analyzed blindly with respect to the cosmological parameters. In a flat ΛCDM cosmology, we find $H_{0} = 73.3_{1.8}^{+1.7}~\mathrm{km~s^{1}~Mpc^{1}}$, a $2.4{{\ \rm per\ cent}}$ precision measurement, in agreement with local measurements of H0 from type Ia supernovae calibrated by the distance ladder, but in 3.1σ tension with Planck observations of the cosmic microwave background (CMB). This method is completely independent of both the supernovae and CMB analyses. Amore »
Cosmic dissonance: are new physics or systematics behind a short sound horizon?
Context. Persistent tension between lowredshift observations and the cosmic microwave background radiation (CMB), in terms of two fundamental distance scales set by the sound horizon r d and the Hubble constant H 0 , suggests new physics beyond the Standard Model, departures from concordance cosmology, or residual systematics. Aims. The role of different probe combinations must be assessed, as well as of different physical models that can alter the expansion history of the Universe and the inferred cosmological parameters. Methods. We examined recently updated distance calibrations from Cepheids, gravitational lensing timedelay observations, and the tip of the red giant branch. Calibrating the baryon acoustic oscillations and type Ia supernovae with combinations of the distance indicators, we obtained a joint and selfconsistent measurement of H 0 and r d at low redshift, independent of cosmological models and CMB inference. In an attempt to alleviate the tension between latetime and CMBbased measurements, we considered four extensions of the standard ΛCDM model. Results. The sound horizon from our different measurements is r d = (137 ± 3 stat. ± 2 syst. ) Mpc based on absolute distance calibration from gravitational lensing and the cosmic distance ladder. Depending on the adopted distance indicators, the combined tension in H more »
 Publication Date:
 NSFPAR ID:
 10175659
 Journal Name:
 Astronomy & Astrophysics
 Volume:
 639
 Page Range or eLocationID:
 A57
 ISSN:
 00046361
 Sponsoring Org:
 National Science Foundation
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