Strong gravitational lenses have provided great insights into the expansion history of the universe and the dark matter distribution from clusters down to sub-galactic scales.
Current state-of-the-art measurements involving strong gravitational lensing are based on samples of order a dozen gravitational lenses. This current decade, with the onset of wide and deep surveys, such as LSST, Euclid...
Time-delay cosmography with lensed quasars is a one-step method for estimating the Hubble constant in the local Universe independently of the cosmic distance ladder. It does not require any intermediate calibration and relies on measuring the time delays between multiple images of strongly lensed quasars, which are inversely proportional to the Hubble constant.
In this talk, we present...
The Hubble constant (H0) is crucial to the understanding of the Universe and its evolution. Hence, one would expect agreement on its value in an era of precision cosmology. However, improvements to direct H0 measurements have resulted in a growing discord with the cosmology-dependent predictions of H0 based on the Cosmic Microwave Background observed by the ESA Planck mission. Importantly,...
