Abstract
Flavor effects can have a significant impact on the final estimate of the lepton (and therefore baryon) asymmetry in scenarios of leptogenesis. It is therefore necessary to account fully for this flavor dynamics in the relevant transport equations that describe the production (and washout) of the asymmetry. Doing so can both open up and restrict viable regions of parameter space relative to the predictions of more approximate calculations. In this paper, we identify the regimes in which flavor effects can be relevant and illustrate their impact in a number of phenomenological models. These include type I and type II seesaw embeddings, and low-scale resonant scenarios. In addition, we provide an overview of the semi-classical and field-theoretic methods that have been developed to capture flavor effects in a consistent way.
Highlights
There have been significant efforts in the literature to develop theoretical frameworks and calculational techniques that allow flavor effects to be captured in a systematic way
On the other hand, when charged-lepton flavor effects are taken into account, the region of parameter space where the next-to-lightest
Flavor correlations in the heavy-neutrino sector contribute to the source of the CP asymmetry, and flavor correlations in the charged-lepton sector are important for determining the washout of the lepton asymmetry
Summary
There have been significant efforts in the literature to develop theoretical frameworks and calculational techniques that allow flavor effects to be captured in a systematic way These efforts span both first-principles field-theoretic and more phenomenologically-inspired semi-classical approaches. Flavor-sensitive rates in the early Universe should scale as |hαα|2T , where T is the temperature These are suppressed by a phase-space factor involving gauge couplings [23] because the leading processes at high temperature are two-bytwo scatterings involving gauge-boson radiation, cf Eq (33) and Eq (34).
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