Phase planes in the universe : chaotic cyclic universes and kicking Chameleons

 

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dc.contributor.advisor Weltman, Amanda en_ZA
dc.contributor.advisor Ellis, George F R en_ZA
dc.contributor.author Platts, Emma en_ZA
dc.date.accessioned 2016-07-20T11:58:09Z
dc.date.available 2016-07-20T11:58:09Z
dc.date.issued 2016 en_ZA
dc.identifier.citation Platts, E. 2016. Phase planes in the universe : chaotic cyclic universes and kicking Chameleons. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/20520
dc.description.abstract This thesis consists of two main sections: chaotic cyclic cosmology and Chameleon gravity in the early universe. Both sections invoke a phase plane analysis as their commonality. The first explores a cyclic model, proposed by Ellis et al, that is in keeping with current observations. No exotic nor new physics is needed for the bounce nor the turnaround. The model is chaotic in nature and requires only that the universe is closed and that dark energy (at some time) decays. The second section contests the claim by Burrage et al. that Chameleon gravity is inconsistent in the early universe, unless constraints on its coupling mechanism are significantly increased. It is shown that the addition of a Dirac-Borne-Infeld (DBI) correction - a consistent, high energy modification - to the Chameleon dynamically renders it weakly coupled to matter. This is done without any fine-tuning and ensures the consistency of the Chameleon at all scales without infringing upon its crucial feature as a dark energy candidate: its elusive but prominent coupling to matter. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Mathematics and Applied Mathematics en_ZA
dc.title Phase planes in the universe : chaotic cyclic universes and kicking Chameleons 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 Mathematics and Applied Mathematics 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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