This thesis explores dark matter through the Axion-like Particle (ALP) portal, emphasizing its interactions with the Standard Model (SM). It discusses historical context and theoretical frameworks—including the type-I seesaw mechanism, which incorporates right-handed neutrinos as potential dark matter candidates, influencing mass scales from eV to GUT levels. The work further elaborates on the phenomenology of dark matter in a two-component model, examining constraints and dynamics induced by an extended U(1)X symmetry. Notably, the large variety of scales and mixing scenarios for right-handed neutrinos contributes to a comprehensive understanding of possible dark matter interactions.
The discovery of neutrino oscillations confirms the necessity of physics beyond the Standard Model, driven by right-handed neutrinos providing mass mechanisms.
Right-handed neutrinos can serve as Majorana dark matter candidates while yielding a variety of mass scales and mixing scenarios with active neutrinos.
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