Uzan, Jean-Philippe2017-05-242017-05-242017-05https://hdl.handle.net/11299/188232Over the past 10 years, I had the chance to hide behind the wall of fundamental constants with Keith, trying to surprise their idle variation. Not catch I may say but it allowed our French-American team to investigate various extensions of general relativity and to test the equivalence principle during big-bang nucleosynthesis and in population III stars. Recently, we dived in the gravity wave background, opening new directions of research on gravity and astrophysics.enFTPIOLIVEFESTPresentation