Conference : Can we say that the universe is 13.8 Ma years old?
Jean-Philippe Uzan is a research director in theoretical physics at CNRS. He works at the Institut d’Astrophysics de Paris and is specialist in gravitation and cosmology. He was also the deputy director of Institut Henri Poincaré from 2013 to 2017. Besides his research he is involved in popularizing science and has been working with many artists. He wrote many books amog which « L’harmonie secrète de l’univers » in 2017 and « Big-bang » in 2018.
During the last century, modern cosmology has established a standard model that allows us to reconstruct the history, evolution and structuration of our universe. It concludes, in particular, that its age in 13.8 Gyr. What does such an affirmation means, what does it assumes and how is it backed up by observation? This talk will higlight the peculiarities of cosmology in order to gauge the credence to such claims.