This thesis investigates dark matter candidates within a minimal extension of the Standard Model, incorporating three right-handed neutrinos (RHNs) and one axion-like particle (ALP). This unique model not only seeks to explain dark matter but also addresses the phenomenon of neutrino oscillations. By analyzing the lightest RHN as dark matter, which adheres to Z2 symmetry, the study identifies parameter regions aligning dark matter predictions with relic abundance. Furthermore, it discusses how this model accounts for null results from major detection experiments, advocating for complementary indirect searches via photons to potentially unveil dark matter characteristics.
In our analysis, we propose a minimal extension of the Standard Model featuring three right-handed neutrinos and one ALP, focusing on dark matter candidates.
This model is compelling as it addresses both dark matter and neutrino oscillations, making the ALP-mediated right-handed neutrino dark matter not only viable but attractive.
We identified key parameter regions allowing our dark matter predictions to align with observed relic abundance, showcasing the model's relevance in explaining the null results from LUX and XENON1T.
Future searches with Fermi-LAT might provide enhanced sensitivity to detect signals in both low and high dark matter mass regions, revealing new insights into its nature.
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