Allan Sandage, one of the 20th century's most influential cosmologists, once described cosmology as "a search for two numbers". One of these, the Hubble constant, has recently become the subject of a large debate in the astronomical community. In this talk I'll go over the history of measurements of the Hubble constant and the evolution of its measured value over time. We'll end with a discussion on the recent discrepancies which have arisen between local and late-time measurements of this parameter. We'll explore what this tension means and how it could impact our understanding of the standard LCDM cosmological model.
As a reminder, the zoom link is: https://stanford.zoom.us/j/94657927984?pwd=TDFnNEtxV2JsVlJaRUtKc0RQZldYZz09