Speaker
Description
We discuss neutrino mass generation and Leptogenesis in GUT-motivated type-I seesaw models, focusing on the connection between matter-antimatter asymmetry and measurable low-energy neutrino parameters. Building on our study of flavour coupling, we show that spectator-induced effects can significantly reshape the viable regions in the space of the lightest neutrino mass, the Dirac CP phase, the atmospheric mixing angle, and the effective mass probed by neutrino-less double beta decay. We then present progress on an extended SO(10)-inspired framework with hierarchical Dirac neutrino masses linked to the up-quark sector. Using current neutrino data and excluding highly fine-tuned crossing-level solutions, we find that these models generically predict a strongly hierarchical right-handed neutrino spectrum and naturally realise successful N2-leptogenesis when the Dirac masses are close to the up-quark masses. This provides a unified framework linking GUT-scale neutrino physics, the cosmic matter-antimatter asymmetry, and upcoming neutrino experiments.