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Study of the Inert Doublet Model in the light of Dark Matter physics and Electroweak Phase Transition


Fabian,  Sven
Florian Goertz - Max Planck Research Group, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Fabian, S. (2020). Study of the Inert Doublet Model in the light of Dark Matter physics and Electroweak Phase Transition. Master Thesis, Ruprecht-Karls-Universität, Heidelberg.

Cite as: http://hdl.handle.net/21.11116/0000-0007-7EC5-E
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.