Split neutrinos - leptogenesis, dark matter and inflation

TL;DR

This paper introduces a unified framework linking neutrino properties, leptogenesis, dark matter, and inflation, where neutrino mixing deviations explain cosmic phenomena and are testable through upcoming experiments.

Contribution

It presents a simple model connecting neutrino mixing, leptogenesis, inflation, and dark matter, with testable predictions for experiments like LHC and neutrinoless double beta decay.

Findings

Neutrino mixing deviations relate to baryon asymmetry and inflation scale.

Lightest right-handed sneutrino as dark matter candidate.

Model predictions are constrained by upcoming experimental data.

Abstract

We propose a simple framework to split neutrinos with a slight departure from tribimaximal mixing - where two of the neutrinos are Majorana type which provide thermal leptogenesis. The Dirac neutrino with a tiny Yukawa coupling explains primordial inflation and the cosmic microwave background radiation, where the inflaton is the gauge invariant flat direction. The observed baryon asymmetry, and the scale of inflation are intimately tied to the observed reactor angle, which can be further constrained by the LHC and the neutrinoless double beta decay experiments. The model also provides the lightest right handed sneutrino as a part of the inflaton to be the dark matter candidate.