The thesis solves coupled Boltzmann equations for freeze-in production and cannibal interactions in scalar theories with Z2/Z3 symmetries, mediator-coupled dark matter, cannibal production during reheating, and a hidden U(1) sector that can undergo an inverse first-order phase transition.
Dark Matter in Groups and Clusters of Galaxies
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abstract
A short story of dark matter as an example of a scientific revolution is given. The characteristics of stellar populations are compared with those of dark halos. The mean mass-to-luminosity ratio of stellar populations is found to be 4 in Solar units. Dark matter around galaxies, and in groups, clusters and voids is discussed. Modern data suggest that the overall density of matter in the Universe is 0.3 +- 0.1, about 80% of this matter is non-baryonic dark matter, and about 20% is baryonic, mostly in the form of hot intra-cluster and intragroup gas, the rest in stellar populations of galaxies. The Universe is dominated by dark energy (cosmological constant) term.
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Dynamics of Self-Interacting Dark Sectors
The thesis solves coupled Boltzmann equations for freeze-in production and cannibal interactions in scalar theories with Z2/Z3 symmetries, mediator-coupled dark matter, cannibal production during reheating, and a hidden U(1) sector that can undergo an inverse first-order phase transition.