Abstract
We study the possibility of generating tiny neutrino mass through a combination of type I and type II seesaw mechanism within the framework of an abelian extension of standard model. The model also provides a naturally stable dark matter candidate in terms of the lightest neutral component of a scalar doublet. We compute the relic abundance of such a dark matter candidate and also point out how the strength of type II seesaw term can affect the relic abundance of dark matter. Such a model which connects neutrino mass and dark matter abundance has the potential of being verified or ruled out in the ongoing neutrino, dark matter, as well as accelerator experiments.
Highlights
Recent discovery of the Higgs boson at the large hadron collider (LHC) experiment has established the standard model (SM) of particle physics as the most successful fundamental theory of nature
Type II seesaw term is generated by the vev of a scalar triplet ∆
In our model the vev of the scalar triplet decides the strength of type II seesaw term, and the mass splitting between the neutral components of the scalar doublet φ
Summary
Presence of dark matter in the Universe is very well established by astrophysics and cosmology experiments the particle nature of dark matter in yet unknown. Some recent works motivated by this idea of connecting neutrino mass and dark matter can be found in [16] In supersymmetric frameworks, such scalar dark matter have been studied in terms of sneutrino dark matter in type I seesaw models [17] as well as inverse seesaw models [18]. We show that in our model, the dark matter abundance can be significantly altered due to the existence of a neutral scalar with mass slightly larger than the mass of dark matter, allowing the possibility of coannihilation Interestingly, this mass splitting is found to be governed by the strength of type II seesaw term of neutrino mass in our model.
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