In the first moments after the Big Bang, the universe expanded many billions of times faster than today. Such rapid expansion is likely due to a primordial force field acting with a new particle, the inflaton. From the latest analysis of the decay of mesons carried out in the LHCb experiment by physicists from Cracow and Zurich, it appears, however, that the most probable light inflaton, a particle with the characteristics of the famous Higgs boson but less massive, almost certainly does not exist.