The quark-hadron transition and hot hadronic matter in the early universe

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dc.contributor.advisorRafelski, Johannen_ZA
dc.contributor.advisorCleymans, Jeanen_ZA
dc.contributor.authorVon Oertzen, Detlof Wilhelmen_ZA
dc.date.accessioned2015-12-20T15:43:50Z
dc.date.available2015-12-20T15:43:50Z
dc.date.issued1987en_ZA
dc.descriptionIncludes bibliographical references.en_ZA
dc.description.abstractVarious calculationsĀ· of the evolution of the hadron gas in the early universe are carried out. To determine the starting point for the evolution equations a phase transition between the quark-gluon plasma phase and the hadron gas phase is constructed. A simple calculation leads to an estimate of the chemical potential of baryons at the quark-hadron phase transition in the early universe. We investigate how the transition temperature depends on the equations of state for the bagged quark and the hadron phase. A particle density evolution model is introduced which predicts the temperature at which particle species drop out of equilibrium (freeze-out) in an expanding universe. We then construct dynamical evolution equations to describe the reactions of interacting pions and photons. In order to model a more realistic hadron gas, we include kaons and finally nucleons and hyperons into the model universe. The results indicate that this type of model should be extended to include more interacting particle species and that a more realistic evolution model is dependent on obtaining accurate reaction cross-sections.en_ZA
dc.identifier.apacitationVon Oertzen, D. W. (1987). <i>The quark-hadron transition and hot hadronic matter in the early universe</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Physics. Retrieved from http://hdl.handle.net/11427/15904en_ZA
dc.identifier.chicagocitationVon Oertzen, Detlof Wilhelm. <i>"The quark-hadron transition and hot hadronic matter in the early universe."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Physics, 1987. http://hdl.handle.net/11427/15904en_ZA
dc.identifier.citationVon Oertzen, D. 1987. The quark-hadron transition and hot hadronic matter in the early universe. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Von Oertzen, Detlof Wilhelm AB - Various calculationsĀ· of the evolution of the hadron gas in the early universe are carried out. To determine the starting point for the evolution equations a phase transition between the quark-gluon plasma phase and the hadron gas phase is constructed. A simple calculation leads to an estimate of the chemical potential of baryons at the quark-hadron phase transition in the early universe. We investigate how the transition temperature depends on the equations of state for the bagged quark and the hadron phase. A particle density evolution model is introduced which predicts the temperature at which particle species drop out of equilibrium (freeze-out) in an expanding universe. We then construct dynamical evolution equations to describe the reactions of interacting pions and photons. In order to model a more realistic hadron gas, we include kaons and finally nucleons and hyperons into the model universe. The results indicate that this type of model should be extended to include more interacting particle species and that a more realistic evolution model is dependent on obtaining accurate reaction cross-sections. DA - 1987 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1987 T1 - The quark-hadron transition and hot hadronic matter in the early universe TI - The quark-hadron transition and hot hadronic matter in the early universe UR - http://hdl.handle.net/11427/15904 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/15904
dc.identifier.vancouvercitationVon Oertzen DW. The quark-hadron transition and hot hadronic matter in the early universe. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Physics, 1987 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/15904en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Physicsen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherQuarksen_ZA
dc.subject.otherHadronsen_ZA
dc.subject.otherNuclear astrophysicsen_ZA
dc.subject.otherTheoretical Physicsen_ZA
dc.titleThe quark-hadron transition and hot hadronic matter in the early universeen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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