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

 

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dc.contributor.advisor Rafelski, Johann en_ZA
dc.contributor.advisor Cleymans, Jean en_ZA
dc.contributor.author Von Oertzen, Detlof Wilhelm en_ZA
dc.date.accessioned 2015-12-20T15:43:50Z
dc.date.available 2015-12-20T15:43:50Z
dc.date.issued 1987 en_ZA
dc.identifier.citation Von Oertzen, D. 1987. The quark-hadron transition and hot hadronic matter in the early universe. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/15904
dc.description Includes bibliographical references. en_ZA
dc.description.abstract Various calculations· 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.language.iso eng en_ZA
dc.subject.other Quarks en_ZA
dc.subject.other Hadrons en_ZA
dc.subject.other Nuclear astrophysics en_ZA
dc.subject.other Theoretical Physics en_ZA
dc.title The quark-hadron transition and hot hadronic matter in the early universe en_ZA
dc.type Thesis / Dissertation en_ZA
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Physics en_ZA
dc.type.qualificationlevel Masters en_ZA
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image


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