The thesis explores various models of dark matter (DM), focusing on Weakly Interacting Massive Particles (WIMPs) that can evade current constraints while being detectable in the future. Subsequent chapters highlight a two-component DM model under the U(1)𝑋 extension of the Standard Model, analyzing theoretical and experimental constraints. Specifically, a pseudo-scalar dark matter candidate is examined for its viability and longevity, with an emphasis on the non-existent scattering amplitude for direct detection at tree level, while one-loop contributions are explored to understand their implications on current detection limits.
To explain Dark Matter, we introduce WIMP models that can bypass constraints and exhibit observable signatures in the future, focusing on relic density and detection challenges.
In chapter 4, we propose a massive pseudo-scalar particle as a candidate for dark matter, with a carefully studied parameter space considering its lifetime and constraints.
The advantage of pseudo-scalar dark matter lies in its vanishing scattering amplitude for direct detection at tree level, allowing for potential compliance with observational limits.
We examine how the U(1)𝑋 symmetry breaking can lead to pseudo-scalar dark matter while maintaining a lifetime much larger than the universe's age.
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