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Abstract:
Albeit there exists a plethora of theories targeted at the description of Dark Matter
(DM) and of the matter-antimatter-asymmetry, evidence for a robust theory beyond
the Standard Model of Particle Physics is pending. In this thesis, I study the Inert
Doublet Model both in the light of DM physics and of Electroweak Phase Transition
(EWPhT). Thereby, the latest limits from the XENON1T experiment as well as further
constraints from cosmology and particle physics are taken into account. After
discussing the dependence of the relic abundance on the mass spectrum and on the
Higgs portal coupling for small and large DM masses, I focus on the low-mass regime
for an in-depth analysis of (co-)annihilations. The constrained parameter space for DM
masses 55 GeV ≤ mH ≤ 75 GeV is investigated in the context of EWPhT, subsequently,
providing for the first time a detailed scan of the parameter space that comprehensively
takes current constraints into account. Lastly, the threefold relation between the EWPhT
types, masses and coupling parameters is examined for benchmark points leading
to the measured relic abundance and to a strong first-order EWPhT either via one or
two steps.
