Some investigation into causal viscous cosmological models with varieble Lambda

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dc.contributor.advisorBeesham, A.
dc.contributor.authorNkosi, Zakhele Thomas
dc.date.accessioned2011-09-28T06:35:28Z
dc.date.available2011-09-28T06:35:28Z
dc.date.issued2001
dc.descriptionThesis submitted to the Faculty of Science and Agriculture in fulfillment for the degree, Doctor of Philosophy, in the Department of Mathematical Sciences, at the University of Zululand, South Africa, 2001.en_US
dc.description.abstractIn this thesis we investigate the evolution of viscous Friedmann-Lemaitre-Robertson-Walker models with a variable cosmological term. The numerical solutions are obtained and represented graphically. Each graph depends on the value of gamma. The present values of the deceleration parameter and density parameter were obtained by using Eckart theory and the truncated theory and given in the tabular form. Power law solutions for the Hubble parameter are shown to exist and we give the values of all the other cosmological variables. The behaviour of the temperature depends on the initial conditions. Furthermore, the equations are also transformed into a plane autonomous system by using dimensionless variables and a dimensionless equation of state, and the qualitative behaviour of the system is investigated. The sets of equilibrium points are determined and their behaviour discussed. The exact value of the Hubble parameter, cosmological term, bulk viscosity pressure and the energy density are obtained and discussed.en_US
dc.description.sponsorshipNational Research Foundationen_US
dc.identifier.other266013
dc.identifier.urihttps://hdl.handle.net/10530/904
dc.language.isoenen_US
dc.subjectCambda calculusen_US
dc.subjectViscosityen_US
dc.titleSome investigation into causal viscous cosmological models with varieble Lambdaen_US
dc.typeThesisen_US
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