Bonn - Small Lecture Hall Mathematics
Non-Equilibrium Thermal Dark Matter
Dark Matter (DM) may have been produced out of thermal equilibrium in the early universe. This possibility has been investigated before through the so-called "Freeze-in" scenario of Feebly-Interacting-Massive-Particles. In this talk I show that this is just a particular case of a general out-of-equilibrium-generated DM, by describing new alternatives which are totally different at a fundamental level. As an example, Grand Unification Theories can naturally lead to such mechanisms, where a DM with unsuppressed couplings can populate the universe to the relic density values we observe today, while never reaching equilibrium with the thermal bath.