KeV right-handed neutrinos from type II seesaw mechanism in a 3-3-1 model

TL;DR

This paper demonstrates how the type II seesaw mechanism within a 3-3-1 model with right-handed neutrinos can produce keV-scale right-handed neutrinos, potentially serving as warm dark matter candidates.

Contribution

It adapts the type II seesaw mechanism to the 3-3-1 model, showing both left- and right-handed neutrino masses can originate from the same Yukawa coupling, with keV-scale right-handed neutrinos emerging naturally.

Findings

At least one right-handed neutrino can have keV-scale mass.

The model can generate small neutrino masses consistent with observations.

KeV right-handed neutrinos are viable dark matter candidates.

Abstract

We adapt the type II seesaw mechanism to the framework of the 3-3-1 model with right-handed neutrinos. We emphasize that the mechanism is capable of generating small masses for the left-handed and right-handed neutrinos and the structure of the model allows that both masses arise from the same Yukawa coupling. For typical values of the free parameters of the model we may obtain at least one right-handed neutrino with mass in the KeV range. Right-handed neutrino with mass in this range is a viable candidate for the warm component of the dark matter existent in the universe.