The influence of anisotropy on gravitational theories of dark energy in the universe - by Molla Mengesha Nigus (Paperback)

Book Synopsis

This thesis titled "Impact of anisotropy on dark energy cosmological

models in theories of gravitation" consists of nine chapters and deals

with the investigation of some spatially homogeneous and anisotropic

dark energy cosmological models in the framework of Einstein's general

theory of gravitation, and also in some other theories of gravitation like

Brans-Dicke (1961) and Saez-Ballester (1986) scalar-tensor theories of

gravitation, which are viable alternatives to Einstein theory of gravitation.

Cosmology is the study of the universe as a whole. It mainly deals with

the mechanism of the evolution of the universe and its components. It

seeks to answer the oldest questions of mankind: How did the universe

come into existence? What is the universe made of? What will happen to

us in the future? There are still many unanswered questions which remain

subject to further scientific investigation and philosophical debate.

According to the modern cosmology, the universe begins with a Big

Bang, and through the evolution of the universe, different fields split from

each other and the components (fluids) of the universe evolve. While the

universe expands, different structures (such as galaxies, black holes, stars

and planets) emerge. In order to study the universe we need to know

its space-time geometry, and the fluids as its components and how they

interact with each other and with space-time. This has been done using

Einstein's theory of gravitation by constructing cosmological models.