During his Bachelor, Yann Gouttenoire had the opportunity to benefit from the excellent quality of courses at the Magistere of Fundamental Physics in Orsay, France. The next year in 2015, he received a 2-year scholarship at École Normale Supérieure Paris-Saclay. The first year, he got awarded the "Agrégation" while in the second year he earned his MS in Theoretical Physics from École Normale Supérieure rue d'Ulm. In 2017, he joined DESY in Hamburg, one of the world's leading center for high-energy particle-physics research, where he studied the topics presented in this book. He defended his PhD on the 29th of September 2020 after which he got awarded the highest distinction from the University of Hamburg ("Summa Cum Laude"). In 2021, he earned an international Postdoctoral Fellowship in Tel Aviv University founded by the Azrieli Foundation.

Introduction.- Standard Model of Elementary Particles.- Standard Model of Cosmology.- Thermal Dark Matter.- Homeopathic Dark Matter.- First-order Cosmological Phase Transition.