A new era of Leptogenesis

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This thesis is devoted to some forefront issues in the field of leptogenesis. As well as nicely explaining the origin of the matter-antimatter asymmetry of the Universe, this mechanism is intimately related to the nature of neutrino masses in that it is the cosmological consequence of the see-saw mechanism. In particular, we discuss the importance of flavor effects, the possible relevance of quantum effects, as well as the role played by the heavier right-handed neutrinos.