PIRSA:19090086

Video URL

https://pirsa.org/19090086

The Present Expansion rate of the Universe, Evidence of New Physics?

Riess, A. (2019). The Present Expansion rate of the Universe, Evidence of New Physics?. Perimeter Institute for Theoretical Physics. https://pirsa.org/19090086

Riess, Adam. The Present Expansion rate of the Universe, Evidence of New Physics?. Perimeter Institute for Theoretical Physics, Sep. 04, 2019, https://pirsa.org/19090086 

          @misc{ scivideos_PIRSA:19090086,
            doi = {10.48660/19090086},
            url = {https://pirsa.org/19090086},
            author = {Riess, Adam},
            keywords = {Cosmology},
            language = {en},
            title = {The Present Expansion rate of the Universe, Evidence of New Physics?},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2019},
            month = {sep},
            note = {PIRSA:19090086 see, \url{https://scivideos.org/index.php/pirsa/19090086}}
          }

Adam Riess Johns Hopkins University - Department of Physics & Astronomy

Talk numberPIRSA:19090086
DOI10.48660/19090086
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

The Hubble constant remains one of the most important parameters in the cosmological model, setting the size and age scales of the Universe. Present uncertainties in the cosmological model including the nature of dark energy, the properties of neutrinos and the scale of departures from flat geometry can be constrained by measurements of the Hubble constant made to higher precision than was possible with the first generations of Hubble Telescope instruments. A streamlined distance ladder constructed from infrared observations of Cepheids and type Ia supernovae with ruthless attention paid to systematics now provide <2% precision and offer the means to do much better. By steadily improving the precision and accuracy of the Hubble constant, we now see evidence for significant deviations from the standard model, referred to as LambdaCDM, and thus the exciting chance, if true, of discovering new fundamental physics such as exotic dark energy, a new relativistic particle, or a small curvature to name a few possibilities. I will review recent and expected progress.