Within the next decade or so, neutrino oscillation experiments will (hopefully) pin down the amount of CP violation in the Standard Model lepton sector. From the viewpoint of theory, this exciting prospect stimulates several important questions: How much CP violation do we actually expect from a theoretical perspective? That is, what predictions can we make for the outcome of upcoming experiments? And similarly important, once we have measured a conclusive signal of leptonic CP violation, what could we possibly learn about the high-energy embedding of the Standard Model from the new experimental data? In this talk, I am going to address these questions in the context of a particular neutrino mass model, which may be regarded as the most important benchmark scenario for future experimental updates: the type-I seesaw mechanism with a minimal number of sterile neutrinos. In fact, this model is the most minimal neutrino mass model that is consistent with all currently available experimental data and hence boasts a maximal predictive power. As I am going to demonstrate, it serves as an ideal playground for phenomenological bottom-up analyses on the one hand as well as for theoretical top-down analyses on the other hand---all of which aim at connecting the anticipated low-energy data with the hypothetical high-energy theory of flavor. This talk is based on a number of recent papers written in the Theory Group at MPIK Heidelberg: arXiv:1611.05857+1611.03827+1612.08878 [hep-ph].

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- Théorie