Hot topics in particle cosmology During this seminar, I will wander across recent developments in particle cosmology. Several Dark Matter models predict some kind of energy injection in the cosmic plasma, which we can currently constrain with better tools mixing cosmological and particle physics computations. Some Dark Matter models predict small interactions with other particles, which may solve the Hubble and sigma8 tensions. The safest output of particle cosmology is still the measurement of neutrino masses, already strongly bounded by the last Planck data. Despite of recent pessimistic developments concerning the galaxy bias in presence of massive neutrinos, there are still excellent prospects to measure neutrino masses with high significance in future surveys, using essentially information from linear scales. This is confirmed by recent conservative forecasts featuring several new physical and computational methods.