Among the major scientific breakthroughs of recent years, the discovery of the Higgs boson and the detection of gravitational waves are spectacular successes crowning decades of effort by a large community. At the same time, the cosmological observations show that the current description of the matter and its interactions is incomplete. Among the open questions are: the nature of dark matter which constitutes most of the matter of the universe today; the absence of antimatter in the cosmos; the origin of the acceleration of the expansion of the universe today and in the first moments just after the Big Bang. I will discuss how all these questions are related to particle physics in the primordial universe.