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Cosmological Histories of a Dark Sector Model

Abdelrahim, Amro ElDaw Babo (2023) Cosmological Histories of a Dark Sector Model. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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The Dark matter problem has been around for almost a century. Its canonical solution is to add a new elementary particle to the Standard Model and investigate its cosmological consequences. Arguably, the most well-motivated possibility, and the one that has driven much of the theoretical and experimental work in the field, is that of a Weakly Interacting Massive Particle (WIMP). Yet, the absence of a WIMP signal pushes one to investigate more complicated scenarios that retain the attractive features of a WIMP. In this work, we consider a dark sector model; where dark matter couples to the ordinary particles indirectly through a singlet mediator. If this mediator is a heavy neutral lepton, it could provide a solution to the neutrino mass problem. Adding a third state to complete the model, the cosmological creation mechanisms of dark matter and the internal dynamics of the dark sector are studied. We recover the WIMP behavior in the large coupling limit, and find that the three dark particles can establish thermal equilibrium when the mediator interacts strongly with dark matter, but weakly with ordinary particles.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Abdelrahim, Amro ElDaw Baboaab107@pitt.eduaab107
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairBatell, Brianbatell@pitt.edubatell
Committee MemberBoyanovsky, Danielboyan@pitt.eduboyan
Committee MemberFreitas, Ayresafreitas@pitt.eduafreitas
Committee MemberPaolone, Vittoriovipres@pitt.eduvipres
Committee MemberPaulini,
Date: 24 January 2023
Date Type: Publication
Defense Date: 30 November 2022
Approval Date: 24 January 2023
Submission Date: 12 December 2022
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 166
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Physics
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Dark Matter, Cosmology, Dark sectors, Neutrino Portal
Date Deposited: 24 Jan 2023 16:10
Last Modified: 24 Jan 2023 16:10

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