Majorana Neutrinos from Inverse Seesaw in Warped Extra Dimension

TL;DR

This paper introduces a warped extra dimension model implementing the inverse seesaw mechanism to generate small Majorana neutrino masses, explaining lepton number violation and predicting light sterile neutrinos consistent with experimental hints.

Contribution

It develops a realistic warped extra dimension model with inverse seesaw, explaining small neutrino masses and predicting light sterile neutrinos compatible with observations.

Findings

Small corrections to neutrino masses from Kaluza-Klein modes

Existence of at least one light sterile neutrino

Model fits observed neutrino oscillation data

Abstract

We propose the inverse seesaw mechanism as a way to understand small Majorana masses for neutrinos in warped extra dimension models with seesaw scale in the TeV range. The ultra-small lepton number violation needed in implementing inverse seesaw mechanism in 4D models is explained in this model as a consequence of lepton number breaking occurring on the Planck brane. We construct realistic models based on this idea that fit observed neutrino oscillation data for both normal and inverted mass patterns. We compute the corrections to light neutrino masses from the Kaluza-Klein modes and show that they are small in the parameter range of interest. Another feature of the model is that the absence of global parity anomaly implies the existence of at least one light sterile neutrino with sterile and active neutrino mixing in the range suggested by the LSND and MiniBooNE observations.