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SS17 – Abstract
Jacopo Ghiglieri
(CERN, Genf)
6.7.2017
Sterile neutrino production in the early universe; (PRETALK for students at 15:30 h);
Abstract: The addition of sterile, massive right-handed neutrinos to the Standard Model represents an economical extension with the potential of accounting for three SM shortcomings: the active (left-handed) neutrino masses and oscillations, the matter-antimatter imbalance of the universe and the nature of Dark Matter. I will start by introducing the model and reviewing the basics of the mechanisms responsible for masses, baryogenesis and DM, i.e. see-saw, leptogenesis and resonant production of keV-scale right-handed neutrinos respectively. I will then concentrate on two related ingredients for computations of leptogenesis and or/dark matter: the right-handed neutrino production rate and the lepton asymmetry washout rate, and show how they can be computed in different regimes, extending to early universe cosmology techniques devised for the QCD plasma in heavy ion physics
