# Dark Energy from pNGB Mediated Dirac Neutrino Condensate

## TL;DR

This paper proposes a unified model linking neutrino masses and dark energy via a pseudo-Nambu-Goldstone boson mediating a Dirac neutrino condensate, offering a cosmologically viable explanation for dark energy.

## Contribution

It introduces a model extending the Standard Model with a global symmetry and scalar fields, connecting neutrino mass generation and dark energy through a neutrino condensate.

## Key findings

- A viable parameter space reproduces observed neutrino masses.
- The model naturally explains dark energy via a neutrino condensate.
- The pseudo-Nambu-Goldstone boson mediates an attractive force for neutrino pairing.

## Abstract

We consider an extension of the Standard Model that provide an unified description of eV scale neutrino mass and dark energy. An explicit model is presented by augmenting the Standard Model with an $SU(2)_L$ doublet scalar, a singlet scalar and right handed neutrinos where all of them are assumed to be charged under a global $U(1)_X$ symmetry. A light pseudo-Nambu-Goldstone Boson, associated with the spontaneously broken $U(1)_{X}$ symmetry, acts as a mediator of an attractive force leading to a Dirac neutrino condensate, with large correlation length, and a non-zero gap in the right range providing a cosmologically feasible dark energy scenario. The neutrino mass is generated through the usual Dirac seesaw mechanism. Parameter space, reproducing viable dark energy scenario while having neutrino mass in the right ballpark, is presented.