Abstract
It has recently been shown that the quantum Boltzmann equations may be relevant for theleptogenesis scenario. In particular, they lead to a time-dependent CP asymmetry whichdepends upon the previous dynamics of the system. This memory effect in the CPasymmetry is particularly important in resonant leptogenesis where the asymmetry isgenerated by the decays of nearly mass-degenerate right-handed neutrinos. We study theimpact of the non-trivial time evolution of the CP asymmetry in the so-called minimallepton flavour violation framework where the charged-lepton and the neutrino Yukawacouplings are the only irreducible sources of lepton flavour symmetry breaking and resonantleptogenesis is achieved. We show that significant quantitative differences arisewith respect to the case in which the time dependence of the CP asymmetry isneglected.
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