A dynamical approach to link low energy phases with leptogenesis

TL;DR

This paper links low energy leptonic CP violation to the generation of the universe's matter-antimatter asymmetry through a dynamical approach in a seesaw model, providing testable predictions for neutrino mixing angles.

Contribution

It introduces a novel dynamical framework connecting low energy CP violation with leptogenesis within a predictive seesaw model, specifically relating the reactor angle to cosmological baryon asymmetry.

Findings

Future observation of CP violation implies leptogenesis without cancellations.

A lower bound on the reactor angle _{13} is established: _{13}^2 \u2265 0.005.

The model successfully links low energy phases to the baryon asymmetry.

Abstract

If lepton masses and mixings are explained by a flavour symmetry in seesaw model which leads to U_{e3}=0 at leading order, we find that, under reasonable assumptions, a future observation of low energy leptonic CP violation implies, barring accidental cancellations, a lepton asymmetry both in flavoured leptogenesis and in its one-flavour approximation. We explicitly implement this approach with a predictive seesaw model for Tri-Bimaximal Mixing (TBM) and show how cosmological baryon asymmetry can be directly trigged by low energy phases appearing in $U_{e3}$. Thanks to this direct correlation we can derive a lower bound on the reactor angle \theta_{13}: \sin^2 \theta_{13} \gtrsim 0.005.