Quantum Resonant Leptogenesis and Minimal Lepton Flavour Violation

TL;DR

This paper investigates how quantum effects and time-dependent CP asymmetry influence resonant leptogenesis within the Minimal Lepton Flavour Violation framework, revealing significant quantitative differences from traditional approaches.

Contribution

It introduces the impact of non-trivial time evolution of CP asymmetry on resonant leptogenesis in the MLFV framework, highlighting the importance of quantum memory effects.

Findings

Time-dependent CP asymmetry significantly alters leptogenesis predictions.

Quantum memory effects are crucial in nearly degenerate neutrino decays.

Quantitative differences compared to static CP asymmetry models.

Abstract

It has been recently shown that the quantum Boltzmann equations may be relevant for the leptogenesis scenario. In particular, they lead to a time-dependent CP asymmetry which depends upon the previous dynamics of the system. This memory effect in the CP asymmetry is particularly important in resonant leptogenesis where the asymmetry is generated by the decays of nearly mass-degenerate right-handed neutrinos. We study the impact of the non-trivial time evolution of the CP asymmetry in the so-called Minimal Lepton Flavour Violation framework where the charged-lepton and the neutrino Yukawa couplings are the only irreducible sources of lepton-flavour symmetry breaking and resonant leptogenesis is achieved. We show that significant quantitative differences arise with respect to the case in which the time dependence of the CP asymmetry is neglected.