2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48086The baryon asymmetry of the universe can be explained by the out-of-equilibrium decays of heavy right-handed neutrinos. We analyse this mechanism in the framework of a supersymmetric extension of the Standard Model and show that lepton number violating scatterings are indispensable for baryogenesis, even though they may wash-out a generated asymmetry. By assuming a similar pattern of mixings and masses for neutrinos and up-type quarks, as suggested by SO(10) unification, we can generate the observed baryon asymmetry without any fine tuning, if (B-L) is broken at the unification scale Λ_{GUT}\sim 10^{16} GeV and, if m_{ν_μ} \sim 3\cdot 10^{-3} eV as preferred by the MSW solution to the solar neutrino deficit.Ph.D. thesis, latex2e, 109 pages, 26 figuresHigh Energy Physics - Phenomenologytext