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Abstract:
The evasive nature of dark matter has been challenging experimentalists and
theorists alike for decades. In order to bridge both approaches, we investigate
the phenomenology that di_erent simplified models would imprint on various
experiments, stressing the importance of the complementarity that they offer.
We also address the different roles that neutrinos can play in the dark matter
problem. Finally, we consider a more complete theory able to explain neutrino
masses and provide a dark matter candidate. We start by analysing the dark sequential
Z’ portal, where direct detection and collider searches put the strongest
bounds to the Majorana fermion, which plays the role of dark matter. Then
we consider a heavy right-handed neutrino as the mediator between the Standard
Model and the dark sector, ruling out dark matter masses below 200 GeV
through indirect detection. We also explore the possibility of a sterile neutrino
in the keV mass range being the dark matter particle itself, assessing how current
and future direct detection experiments can impose limits. We conclude by
analysing the phenomenology of a Two Higgs-Doublet Model, with the addition
of a U(1)X gauge symmetry in order to avoid flavour changing neutral interactions
and produce neutrino masses at the same time. Further constraints are
imposed when dark matter is added in this context.
