We will see how CP invariants emerge in the analytical solutions of the quantum kinetic equations, which will, in turn, reveal previously undiscovered correlations among various observables.
For non-degenerate right-handed neutrinos, a significant modification of the neutrinoless double-beta decay rate is anticipated compared to that of active neutrinos, at reach of current and future experiments, and a highly constrained flavor structure for the mixing with the active neutrinos. On the other hand, for degenerate right-handed neutrinos, we will see how light neutrino oscillations and collider experiments are sufficient to fully predict both the baryon asymmetry and the amplitude of neutrinoless double-beta decay.