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We explore the possibility of having a successful leptogenesis throughoscillations between new sterile fermion states added to the Standard Modelfield content in a well motivated framework, naturally giving rise to therequired mass splitting between the sterile states through a small total leptonnumber violation. We propose a framework with only two sterile states forming apseudo-Dirac state, in which their mass difference as well as the smallness ofthe neutrino masses are due to two sources of lepton number violation with$\Delta L=2$, corresponding to an Inverse Seesaw framework extended by a LinearSeesaw mass term. We also explore the pure Inverse Seesaw mechanism in itsminimal version, requiring at least four new sterile states in order to complywith neutrino data. Our analytical and numerical studies reveal that one canhave a successful leptogenesis at the temperature of the electroweak scalethrough oscillations between the two sterile states with a "natural" origin ofthe strong degeneracy in their mass spectrum. We also revisit the analyticalexpression of the baryon asymmetry of the Universe in the weak washout regimeof this framework.

Lepton number violation as a key to low-scale leptogenesis