Neutrino dark energy and leptogenesis with TeV scale triplets

TL;DR

This paper presents models extending the Standard Model with TeV-scale triplets to realize neutrino mass varying dark energy and leptogenesis, offering testable predictions at the LHC.

Contribution

It introduces two novel TeV-scale triplet extensions of the Standard Model that connect neutrino mass variation, dark energy, and leptogenesis.

Findings

Models achieve natural neutrino mass variation linked to the acceleron.

Possible leptogenesis mechanisms compatible with observed baryon asymmetry.

Testable collider signatures at the LHC for the new TeV-scale fields.

Abstract

We propose a realization of mass varying neutrino dark energy in two extensions of the Standard Model (SM) with a dynamical neutrino mass related to the acceleron field while satisfying the naturalness. In the first scenario the SM is extended to include a TeV scale scalar Higgs triplet ($\xi$) and a TeV scale second Higgs doublet ($\eta$), while in the second scenario an extension of the SM with fermion triplet $(\Sigma)$ is considered. We also point out the possible leptogenesis mechanisms for simultaneously generating the observed baryon asymmetry of the universe in both the scenarios and discuss the collider signatures for the TeV scale new fields which make these models testable in the current run of LHC.