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Impacts of an extra scalar and a strongly coupled dark sector on the physics of the early universe

van der Woude, Susan

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In this thesis two aspects of Standard Model extensions are discussed. Firstly, a Standard Model extension with a strongly coupled hidden sector is investigated. For suitable parameters, such a hidden sector is expected to undergo a first order phase transition, consequently resulting in the production of gravitational waves. Due to their strongly coupled nature, effective low energy models have to be used to determine the phase transition dynamics and calculate the predicted gravitational wave signals. It is shown that different effective models in general predict similar but by no means equal gravitational wave signals. Thus showing that calculations from first principles, like lattice calculations, are needed. Secondly, scalar extensions are discussed, which can result in a first order electroweak phase transition. In contrast to phase transitions in strongly coupled sectors, the dynamics of these phase transitions is rather well known. Consequently, the gravitational wave signals from the electroweak phase transition can be predicted reasonably well. In this thesis, instead of phase transition dynamics, a different aspect of scalar extensions will be discussed, namely their effect on leptogenesis via oscillations. Our results show that a scalar extension in general reduces the produced baryon asymmetry of the Universe. In the future these results, together with possible proof of a first order phase transition, can be used to further constrain scalar extensions.

Document type: Dissertation
Supervisor: Lindner, Prof. Dr. Dr. h.c. Manfred
Place of Publication: Heidelberg
Date of thesis defense: 15 December 2021
Date Deposited: 05 Jan 2022 09:16
Date: 2021
Faculties / Institutes: The Faculty of Physics and Astronomy > Dekanat der Fakultät für Physik und Astronomie
Service facilities > Max-Planck-Institute allgemein
Service facilities > Max-Planck-Institute allgemein > MPI for Nuclear Physics
DDC-classification: 530 Physics
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