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Browsing by Author "Clarkson, Chris"

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A covariant approach to gravitational lensing

Author: De Swardt, Bonita Date: 2004 The main focus of this thesis is to study the properties of null geodesics in general relativistic models. This thesis is divided into two parts. In the first part, we introduce the (1+3)-covariant approach which will be used in our study of ... Read more
Galaxy correlations and the BAO in a void universe: structure formation as a test of the Copernican Principle

Author: February, Sean ; Clarkson, Chris ; Maartens, Roy Date: 19 A suggested solution to the dark energy problem is the void model, where accelerated expansion is replaced by Hubble-scale inhomogeneity. In these models, density perturbations grow on a radially inhomogeneous background. This large scale ... Read more
General relativistic electrodynamics with applications in cosmology and astrophysics

Author: Betschart, Gerold Date: 2005 Includes bibliographical references. Read more
The influence of structure formation on the evolution of the universe

Author: Umeh, Obinna Date: 2013 The next generation of telescopes will usher in a new era of precision cosmology capable of determining key parameters of a cosmological model to percent level and beyond. For this to be effective, the theoretical model must be understood to ... Read more
Non-linear effects in the universe

Author: Lu, Hui-Ching Date: 2009 One of the distinct trends in modern cosmology is in testing its theoretical aspects against the high precision data available in recent years. Although the standard cosmological model has already shown certain satisfactory results in matching ... Read more
On the evolution of large-scale structure in a cosmic void

Author: February, Sean Phillip Date: 2014 Future large-scale structure surveys are expected to pin-down the properties of dark energy significantly more by mapping the cosmic web to unprecedented precision. To take advantage of such state-of-the-art technologies, the evermore accurate ... Read more
Relativistic corrections to weak lensing convergence

Author: Andrianomena, Sambatra Hagatiana Date: 2016 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 ... Read more
Rendering dark energy void

Author: February, Sean Phillip Date: 2009 The current model of cosmology, the Friedman-Lemaitre-Robertson-Valker model, assumes that the universe is approximately homogeneous and isotropic on very large scales. Further assuming flatness and dark energy in the form of Einstein's ... Read more
Topics in relativistic cosmology: Cosmology on the past lightcone and in modified gravitation

Author: Elmardi, Maye Y A Date: 2018 The lightcone gauge is a set of what are called the observational coordinates adapted to our past lightcone. We develop this gauge by producing a perturbed spacetime metric that describes the geometry of our past lightcone where observations ... Read more

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Browsing by Author "Clarkson, Chris"

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