Cosmological constraints on sub-GeV dark vectors

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dc.contributor.authorCoffey, John
dc.contributor.supervisorMorrissey, David
dc.contributor.supervisorRitz, Adam
dc.date.accessioned2020-04-21T20:18:37Z
dc.date.available2020-04-21T20:18:37Z
dc.date.copyright2020en_US
dc.date.issued2020-04-21
dc.degree.departmentDepartment of Physics and Astronomyen_US
dc.degree.levelMaster of Science M.Sc.en_US
dc.description.abstractThe purpose of this thesis is to recognize the effects of electromagnetic energy injection into the early Universe from decaying sub-GeV dark vectors. Decay widths and energy spectra for the most prominent channels in the sub-GeV region are calculated for various dark vector models. The models include the kinetic mixing of the dark photon with the Standard Model photon, U(1)_A' , a dark vector boson which couples to the baryon minus the lepton current, U(1)_B-L, and the last three are dark vector bosons which couple one lepton's current minus a different lepton's current, U(1)_Li-Lj where i != j = e, mu, tau . Measurements from Big Bang Nucleosynthesis and the Cosmic Microwave Background are used to constrain the lifetime, mass and coupling constant of the dark vectors.en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/11690
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.subjectBig Bang Nucleosynthesisen_US
dc.subjectCosmic Microwave Backgrounden_US
dc.subjectdark vectorsen_US
dc.subjectsub-GeVen_US
dc.subjectCosmological Constraintsen_US
dc.titleCosmological constraints on sub-GeV dark vectorsen_US
dc.typeThesisen_US

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