Observational constraints on higher-dimensional and variable-[lambda] cosmologies

dc.contributor.authorOverduin, J. M.
dc.contributor.supervisorCooperstock, F.
dc.date.accessioned2017-06-30T22:08:07Z
dc.date.available2017-06-30T22:08:07Z
dc.date.copyright1997en_US
dc.date.issued2017-06-30
dc.degree.departmentDepartment of Physics and Astronomyen_US
dc.degree.levelDoctor of Philosophy Ph.D.en_US
dc.description.abstractNonstandard cosmological models of two broad classes are examined: those in which there are more than four spacetime dimensions, and those in which there is a variable cosmological “constant” Λ. We test claims that a number of higher-dimensional models give rise to inflation. New constraints are placed on such models, and a number of them are ruled out. We then investigate the potential of variable-Λ theories to address the problem of the initial singularity. We consider a number of different phenomenological representations for this parameter, assessing their implications for the evolution of the cosmological scale factor as well as a range of observational data. In several cases we find nonsingular models which are compatible with observation.en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/8311
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.subjectAstronomyen_US
dc.subjectCosmologyen_US
dc.subjectConstraints (Physics)en_US
dc.titleObservational constraints on higher-dimensional and variable-[lambda] cosmologiesen_US
dc.typeThesisen_US

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