Speaker
Mrs
Heba Abdulrahman
(North West University, South Africa)
Description
Recent developments in observational cosmology and astronomy (such as
the apparent discovery of the accelerated expansion of the Universe and the
existence of dark matter) have put theoretical physics in general and cosmology in particular into crisis. In this thesis, we introduce a detailed review of Einstein’s theory of general relativity by which standard cosmology based on.
We present the challenges to Einstein theory of gravity and the difficulties of the current theoretical cosmology in explaining the accelerated expansion of the
Universe. Although General Relativity Theory (GR) is a generalization of Newtonian Gravity in the presence of strong gravitational fields, there is no properly defined Newtonian limit of (GR) on cosmological scales. Recently, general relativistic quasi-Newtonian cosmologies have been studied in the context of large scale structure formation and nonlinear gravitational collapse in the late-time
Universe. This despite the general covariant inconsistency of these cosmological models except in some special cases such as the spatially homogeneous and isotropic, spherically symmetric, expanding (FLRW) spacetimes. Higher-order
gravitational theories, such as f (R) models, have been shown to exhibit more shared properties with Newtonian gravitation than does GR. In this work, we study the existence and integrability conditions of quasi-Newtonian cosmological spacetimes in Scalar-Tensor theories of gravitation. We will also derive the
covariant density and velocity perturbations of such models and analyze the corresponding solutions.
Apply to be<br> considered for a student <br> award (Yes / No)?
yes
Main supervisor (name and email)<br>and his / her institution
Dr.Amare Abebe
amare.abbebe@gmail.com
North West University
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
no
Level for award<br> (Hons, MSc, <br> PhD, N/A)?
Msc
Primary author
Mrs
Heba Abdulrahman
(North West University, South Africa)
