Non-thermal leptogenesis with distinct CP violation and minimal dark matter

TL;DR

This paper proposes a unified model linking neutrino mass, baryon asymmetry, dark matter, and inflation, where CP violation arises from the neutrino mass matrix, and the model incorporates minimal dark matter and multiple seesaw mechanisms.

Contribution

It introduces a novel unified framework combining inflation, dark matter, and leptogenesis with CP violation sourced solely from the neutrino mass matrix.

Findings

Demonstrates a consistent scenario for neutrino mass and baryon asymmetry.

Shows how CP violation in leptogenesis is derived from the neutrino mass matrix.

Integrates minimal dark matter with inflation and leptogenesis in a single model.

Abstract

We demonstrate a unified scenario for neutrino mass, baryon asymmetry, dark matter and inflation. In addition to a fermion triplet for the so-called minimal dark matter, we extend the standard model by three heavy fields including a scalar singlet, a fermion triplet and a fermion singlet/Higgs triplet. The heavy scalar singlet, which is expected to drive an inflation, and the dark matter fermion triplet are odd under an unbroken $Z_2^{}$ discrete symmetry, while the other fields are all even. The heavy fermion triplet offers a tree-level type-III seesaw and then mediates a three-body decay of the inflaton into the standard model lepton and Higgs doublets with the dark matter fermion triplet. The heavy fermion singlet/Higgs triplet not only results in a type-I/II seesaw at tree level but also contributes to the inflaton decay at one-loop level. In this scenario, the type-I/II seesaw contains all of the physical CP phases in the lepton sector and hence the CP violation for the non-thermal leptogenesis by the inflaton decay exactly comes from the imaginary part of the neutrino mass matrix.