Higgs-Portal and Z'-Portal Dark Matters in Brane-World Cosmologies

dc.contributorTownsley, Dean
dc.contributorRumerio, Paolo
dc.contributorWang, Ryan
dc.contributorVillalba, Desmond
dc.contributor.advisorOkada, Nobuchika
dc.contributor.authorLiu, Taoli
dc.date.accessioned2024-02-20T16:34:20Z
dc.date.available2024-02-20T16:34:20Z
dc.date.issued2023
dc.descriptionElectronic Thesis or Dissertationen_US
dc.description.abstractAccording to various astrophysical and cosmological observations, Dark Matter (DM) accounts for approximately 27% of the Universe's total energy density. However, no viable DM particle candidate exists within the framework of the Standard Model (SM) of particle physics. An electrically neutral, weakly interacting massive particle (WIMP) from physics beyond theSM emerges as an appealing candidate for DM. In this dissertation research, we consider the WIMP DM model within the framework of 5-dimensional brane-world cosmology. In this setup, our familiar 3-dimensional space is realized as a hyper-surface embedded in a 4-dimensional space. Within this context, all SM and DM fields are confined to the hyper-surface, while the graviton resides in the bulk. We explore two well-established brane-world cosmologies: the Randall-Sundrum (RS) and the Gauss-Bonnet (GB)brane-world cosmologies. These models reproduce the standard Big Bang cosmology at temperatures below the so-called "transition temperature." However, at higher temperatures, they introduce significant modifications to the universe's expansion dynamics. This non-standard expansion law directly influences the predictions related to WIMP DM physics.In our investigation, we consider two well-founded WIMP DM models: the Higgs-portal scalar DM model and the Z′-portal DM model. We analyze the effects of brane-world cosmology and identify the allowed parameter space by incorporating constraints from the observed DM relic density, as well as data from direct and indirect DM detection experiments. It is worth noting that for both DM models, the allowed parameter regions are severely restricted within the conventional Big Bang cosmological framework. Our findings reveal that these allowed parameter regions face even more stringent limitations in the RS cosmology, and in some cases, they may even disappear entirely. Conversely, the GB cosmological effects significantly expand the regions of parameter space that are allowed. Furthermore, the discovery of Higgs-portal or Z′-portal DM within the GB brane-worldcosmology would enable us to determine the transition temperature.en_US
dc.format.mediumelectronic
dc.format.mimetypeapplication/pdf
dc.identifier.other1028310
dc.identifier.urihttps://ir.ua.edu/handle/123456789/13171
dc.languageEnglish
dc.language.isoen_US
dc.publisherUniversity of Alabama Libraries
dc.relation.hasversionborn digital
dc.relation.ispartofThe University of Alabama Electronic Theses and Dissertations
dc.relation.ispartofThe University of Alabama Libraries Digital Collections
dc.rightsAll rights reserved by the author unless otherwise indicated.en_US
dc.subjectBrane-world
dc.subjectDark Matter
dc.subjectHiggs-portal
dc.subjectHigher dimensional cosmology
dc.subjectZ'-portal
dc.titleHiggs-Portal and Z'-Portal Dark Matters in Brane-World Cosmologiesen_US
dc.typethesis
dc.typetext
etdms.degree.departmentUniversity of Alabama. Department of Physics and Astronomy
etdms.degree.disciplinePhysics
etdms.degree.grantorThe University of Alabama
etdms.degree.leveldoctoral
etdms.degree.namePh.D.
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