Speaker
Description
The current expansion rate of the Universe is captured by the so-called Hubble constant, or its dimensionless equivalent, "little h", which is a key parameter in the, extremely successful, standard model of cosmology. The Hubble constant relates measurements of the expansion history of the Universe to its components, and “little h” appears in all astrophysical quantities which measurement or calibration somewhat depend on the background cosmology. The ‘Hubble tension’ has motivated the exploration of extensions to the standard cosmological model in which higher values of H0 can be obtained from CMB measurements and galaxy surveys. The Hubble trouble, however, goes beyond H0. Modifications invoked to address the Hubble tension affect other quantities too, such as cosmic times, age of the Universe and the matter density. Any Hubble trouble has implications well beyond H0 itself. I will recap some recent results and try to look at the tension in both a model-dependent and model independent way.
