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

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dc.contributor.advisorWeltman, Amandaen_ZA
dc.contributor.advisorEllis, George F Ren_ZA
dc.contributor.authorPlatts, Emmaen_ZA
dc.date.accessioned2016-07-20T11:58:09Z
dc.date.available2016-07-20T11:58:09Z
dc.date.issued2016en_ZA
dc.description.abstractThis 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.identifier.apacitationPlatts, E. (2016). <i>Phase planes in the universe : chaotic cyclic universes and kicking Chameleons</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Mathematics and Applied Mathematics. Retrieved from http://hdl.handle.net/11427/20520en_ZA
dc.identifier.chicagocitationPlatts, Emma. <i>"Phase planes in the universe : chaotic cyclic universes and kicking Chameleons."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Mathematics and Applied Mathematics, 2016. http://hdl.handle.net/11427/20520en_ZA
dc.identifier.citationPlatts, E. 2016. Phase planes in the universe : chaotic cyclic universes and kicking Chameleons. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Platts, Emma AB - 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. DA - 2016 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2016 T1 - Phase planes in the universe : chaotic cyclic universes and kicking Chameleons TI - Phase planes in the universe : chaotic cyclic universes and kicking Chameleons UR - http://hdl.handle.net/11427/20520 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/20520
dc.identifier.vancouvercitationPlatts E. Phase planes in the universe : chaotic cyclic universes and kicking Chameleons. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Mathematics and Applied Mathematics, 2016 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/20520en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Mathematics and Applied Mathematicsen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherMathematics and Applied Mathematicsen_ZA
dc.titlePhase planes in the universe : chaotic cyclic universes and kicking Chameleonsen_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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