Light Neutrinos from a Mini-Seesaw Mechanism in Warped Space

TL;DR

This paper proposes a warped space model that combines suppressed Dirac and Majorana scales in a mini-seesaw mechanism, explaining light neutrino masses through a dual strongly coupled 4D theory with composite right-handed neutrinos.

Contribution

It introduces a novel warped space framework that realizes a mini-seesaw mechanism with low-scale Dirac and Majorana masses, providing an alternative explanation for light neutrinos.

Findings

The model naturally generates light neutrino masses with suppressed scales.

Duality via AdS/CFT links the 5D warped model to a 4D strongly coupled theory.

The framework accommodates scales below the weak scale for neutrino mass generation.

Abstract

The seesaw mechanism provides a simple explanation for the lightness of the known neutrinos. Under the standard assumption of a weak scale Dirac mass and a heavy sterile Majorana scale the neutrino mass is naturally suppressed below the weak scale. However, Nature may employ Dirac and Majorana scales that are much less than typically assumed, possibly even far below the weak scale. In this case the seesaw mechanism alone would not completely explain the lightness of the neutrinos. In this work we consider a warped framework that realizes this possibility by combining naturally suppressed Dirac and Majorana scales together in a mini-seesaw mechanism to generate light neutrino masses. Via the AdS/CFT correspondence the model is dual to a 4D theory with a hidden strongly coupled sector containing light composite right-handed neutrinos.