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dc.contributor.advisorUnwin, James
dc.contributor.advisorLicht, Arthur
dc.creatorHamdan, Saleh
dc.date.accessioned2018-11-27T16:29:21Z
dc.date.available2018-11-27T16:29:21Z
dc.date.created2018-08
dc.date.issued2018-08-09
dc.date.submittedAugust 2018
dc.identifier.urihttp://hdl.handle.net/10027/23035
dc.description.abstractThe universe has evolved through several phases as its various constituents dominated its energy content. Candidate dark matter particles may have undergone freeze-out during any such phase. While the standard freeze-out scenarios have been explored during the radiation-dominated era, and more recently during scalar field decay, this work extends the study of dark matter freeze-out to a potential early period during which the universe is matter-dominated and its evolution adiabatic. Decoupling during an adiabatic matter dominated era changes the freeze-out dynamics, since the Hubble rate is parametrically different for matter and radiation domination. Furthermore, for successful Big Bang Nucleosynthesis the state dominating the early universe energy density must decay, this dilutes (or repopulates) the dark matter. As a result, the masses and couplings required to match the observed dark matter relic density can differ significantly from radiation dominated freeze-out.
dc.format.mimetypeapplication/pdf
dc.subjectdark matter
dc.subjectfreeze-out
dc.subjectcosmology
dc.subjectmatter domination
dc.subjectmatter dominated
dc.subjecthiggs portal
dc.subjectthermal relic
dc.subjectrelic density
dc.titleDark Matter Freeze-out in a Matter Dominated Universe
dc.typeThesis
thesis.degree.departmentPhysics
thesis.degree.grantorUniversity of Illinois at Chicago
thesis.degree.levelDoctoral
thesis.degree.namePhD, Doctor of Philosophy
dc.contributor.committeeMemberCavanaugh, Richard
dc.contributor.committeeMemberKolda, Christopher
dc.type.materialtext
dc.contributor.chairKeung, Wai-Yee


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