Relativistic corrections to weak lensing convergence

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dc.contributor.advisorClarkson, Chrisen_ZA
dc.contributor.authorAndrianomena, Sambatra Hagatianaen_ZA
dc.date.accessioned2016-07-26T12:15:33Z
dc.date.available2016-07-26T12:15:33Z
dc.date.issued2016en_ZA
dc.description.abstractA fundamental issue in modern science is the dark energy problem - the apparent accelerating expansion of the universe. Many cosmological observations of the Cosmic Microwave Background (CMB), Baryon Acoustic Oscillation (BAO) and weak lensing have been carried out to try to understand the nature of this repulsive dark force. With the advent of advanced experiments like the Square Kilometer Array we enter the era of precision cosmology where measurements of effects such as weak lensing will be achieved at a sub percent level, implying strong constraints on dark energy. The full picture of weak lensing includes linear and non-linear correction terms to its standard formula. In this thesis we address the questions: Are some of these effects detectable? Under which conditions can we safely neglect them such that the analysis of future weak lensing observations is not biased? Induced by gravity, peculiar velocity of galaxies can potentially be used to probe the growth of structure in our universe. Peculiar velocities induce a lensing-like effect, which we consider as Doppler magnification. By developing new statistical tools which are based on Doppler magnification, we investigate the dark energy problem. These new statistical probes also enable us to explore the viability of other theories that attempt to account for the apparent acceleration of the cosmic expansion by modifying Einstein's General Relativity.en_ZA
dc.identifier.apacitationAndrianomena, S. H. (2016). <i>Relativistic corrections to weak lensing convergence</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Mathematics and Applied Mathematics. Retrieved from http://hdl.handle.net/11427/20770en_ZA
dc.identifier.chicagocitationAndrianomena, Sambatra Hagatiana. <i>"Relativistic corrections to weak lensing convergence."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Mathematics and Applied Mathematics, 2016. http://hdl.handle.net/11427/20770en_ZA
dc.identifier.citationAndrianomena, S. 2016. Relativistic corrections to weak lensing convergence. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Andrianomena, Sambatra Hagatiana AB - A fundamental issue in modern science is the dark energy problem - the apparent accelerating expansion of the universe. Many cosmological observations of the Cosmic Microwave Background (CMB), Baryon Acoustic Oscillation (BAO) and weak lensing have been carried out to try to understand the nature of this repulsive dark force. With the advent of advanced experiments like the Square Kilometer Array we enter the era of precision cosmology where measurements of effects such as weak lensing will be achieved at a sub percent level, implying strong constraints on dark energy. The full picture of weak lensing includes linear and non-linear correction terms to its standard formula. In this thesis we address the questions: Are some of these effects detectable? Under which conditions can we safely neglect them such that the analysis of future weak lensing observations is not biased? Induced by gravity, peculiar velocity of galaxies can potentially be used to probe the growth of structure in our universe. Peculiar velocities induce a lensing-like effect, which we consider as Doppler magnification. By developing new statistical tools which are based on Doppler magnification, we investigate the dark energy problem. These new statistical probes also enable us to explore the viability of other theories that attempt to account for the apparent acceleration of the cosmic expansion by modifying Einstein's General Relativity. DA - 2016 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2016 T1 - Relativistic corrections to weak lensing convergence TI - Relativistic corrections to weak lensing convergence UR - http://hdl.handle.net/11427/20770 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/20770
dc.identifier.vancouvercitationAndrianomena SH. Relativistic corrections to weak lensing convergence. [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/11427/20770en_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.titleRelativistic corrections to weak lensing convergenceen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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