Naturally Light Dirac Neutrinos from $SO(10) \times U(1)_\psi$

TL;DR

This paper proposes a novel framework within grand unified theories where right-handed and left-handed neutrinos form naturally light Dirac neutrinos through specific symmetry breaking patterns involving $E_6$, $SO(10)$, and $SU(5)$.

Contribution

It introduces a new mechanism for naturally light Dirac neutrinos by pairing $ u_R$ with $ u_L$ within an $E_6$-based symmetry breaking chain.

Findings

Neutrinos can be naturally light Dirac particles in this framework.

The model aligns with grand unified theories and specific symmetry breaking patterns.

Provides a new perspective on neutrino mass generation.

Abstract

A new solution is presented where the right-handed neutrino $\nu_R$ in $SO(10)$ pairs up with $\nu_L$ to form a naturally light Dirac neutrino. It is based on the framework of $E_6 \to SO(10) \times U(1)_\psi$, then $SO(10) \to SU(5) \times U(1)_\chi$.