Leptogenesis and neutrino masses

I review the connections between the leptogenesis performance in producing the cosmic baryon asymmetry, and the light neutrino masses generated via the seesaw mechanism. After a general introduction, I clarify under which assumptions leptogenesis can provide a reliable upper limit on the neutrino mass scale. Assuming these conditions hold, a dedicated numerical analysis that includes the effects of the Higgs density-asymmetry, scatterings with the top-quark, thermal corrections, and other subleading effects, yields a 3σ limit .