FIMP DM in the Extended Hyperchargeless Higgs Triplet Model

TL;DR

This paper investigates a feebly interacting dark matter candidate within an extended Higgs triplet model, demonstrating how the model can satisfy relic density and neutrino data through the Freeze-in mechanism.

Contribution

It introduces an extended hyperchargeless Higgs triplet model with a neutral fermion singlet and vector-like doublets, providing a novel framework for FIMP dark matter and neutrino mass generation.

Findings

Identifies parameter regions consistent with relic density and neutrino data.

Shows the role of fermion mixing in controlling dark matter relic abundance.

Demonstrates the model's viability for explaining dark matter and neutrino properties.

Abstract

We perform an exclusive study on the Feebly Interacting Massive Particle (FIMP) dark matter candidate in an extended hyperchargeless ($Y=0$) Higgs triplet model. The additional $Z_2$ odd neutral fermion singlet plays the role of dark matter with support from two other vector-like fermion doublets. The mixing between the neutral component of a doublet and singlet fermions controls the current relic density through the Freeze-in mechanism, whereas the additional doublet fermion helps to get the neutrino mass and mixing angles. We obtain a broad region of the parameter spaces satisfying the current relic density and neutrino mass and mixing angles.