Separate seesaw and its applications to dark matter and baryogenesis

TL;DR

This paper introduces a novel extra-dimensional seesaw model where right-handed neutrinos are bulk fields with generation-dependent localizations, leading to unique neutrino mass spectra suitable for dark matter and baryogenesis.

Contribution

It presents a new seesaw framework with generation-specific localization effects in extra dimensions, enhancing the understanding of neutrino masses and their role in cosmology.

Findings

Mass spectra favoring neutrino dark matter

Generation-dependent suppression factors

Compatibility with baryogenesis scenarios

Abstract

We propose a new seesaw model in an extra-dimensional setup where only right-handed neutrinos are bulk fields. In the model, localizations of an extra-dimensional wave function and brane Majorana mass of the right-handed neutrinos can be different among each generation of the right-handed neutrinos. The setup can lead to different suppression factor dependences of effective right-handed neutrino masses and neutrino Yukawa couplings for each generation. It is shown that the resultant mass spectra of the right-handed neutrinos and neutrino Yukawa couplings are favored in models of neutrino dark matter with baryogenesis.