New Anisotropic Cosmological Models and Two-Fluid Energy Models

The global structure of space-times satisfying Einstein's ¯eld equations remains an active area of research, more than 80 years after the theory of general relativity was formulated. Space-times that are of physical interest can be separated intotwo main types, (i) ones of isolated system and...

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Main Author:	Hassan, Amirhashchi
Format:	Thesis
Language:	English English
Published:	2011
Subjects:	Anisotropy Cosmology Dark energy (Astronomy)
Online Access:	http://psasir.upm.edu.my/id/eprint/19609/1/FS_2011_20x.pdf
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id	my-upm-ir.19609
record_format	uketd_dc
spelling	my-upm-ir.196092014-04-22T03:45:20Z New Anisotropic Cosmological Models and Two-Fluid Energy Models 2011-04 Hassan, Amirhashchi The global structure of space-times satisfying Einstein's ¯eld equations remains an active area of research, more than 80 years after the theory of general relativity was formulated. Space-times that are of physical interest can be separated intotwo main types, (i) ones of isolated system and (ii) ones that model the whole universe. This thesis is about the second type, cosmological models. This study is focused on obtaining exact anisotropic solution for Einstein's field equations (EFEs) as a cosmologically accepted physical models for the universe (at least in the early stages). We have investigated the gravitational e®ects of diferent types of matter i.e. electromagnetic field, bulk viscus °uid, cosmic strings and cos-mological constant as the matter (energy) sources in the energy-momentum tensor of the Einstein's field equations. Also, a new class of exact solutions of Einstein's modified field equations in inhomogeneous space-time for perfect fuid distribution with electromagnetic field is obtained in the context of normal gauge for Lyra's manifold. We have obtained solutions by considering the time dependent displacement field. We have also studied the time varying gravitational constant (G) which has many interesting consequences in astrophysics. G-varying cosmology is consistent with whatsoever cosmological observations available at present. The Newtonian constant of gravitation plays the role of a coupling constant between geometry and matter in the Einstein field equation. The large number hypothesis proposed by Dirac leads to a cosmology when G varies with time. The geometrical and physical behaviors of all models are also discussed. Moreover in my research we have investigated the e®ect of interaction between barotropic °uid and dark energy on the equation of state parameter in FRW space-time by considering a variable deceleration parameter. Anisotropy Cosmology Dark energy (Astronomy) 2011-04 Thesis http://psasir.upm.edu.my/id/eprint/19609/ http://psasir.upm.edu.my/id/eprint/19609/1/FS_2011_20x.pdf application/pdf en public phd doctoral Universiti Putra Malaysia Anisotropy Cosmology Dark energy (Astronomy) Faculty of Science English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Anisotropy Cosmology Dark energy (Astronomy)
spellingShingle	Anisotropy Cosmology Dark energy (Astronomy) Hassan, Amirhashchi New Anisotropic Cosmological Models and Two-Fluid Energy Models
description	The global structure of space-times satisfying Einstein's ¯eld equations remains an active area of research, more than 80 years after the theory of general relativity was formulated. Space-times that are of physical interest can be separated intotwo main types, (i) ones of isolated system and (ii) ones that model the whole universe. This thesis is about the second type, cosmological models. This study is focused on obtaining exact anisotropic solution for Einstein's field equations (EFEs) as a cosmologically accepted physical models for the universe (at least in the early stages). We have investigated the gravitational e®ects of diferent types of matter i.e. electromagnetic field, bulk viscus °uid, cosmic strings and cos-mological constant as the matter (energy) sources in the energy-momentum tensor of the Einstein's field equations. Also, a new class of exact solutions of Einstein's modified field equations in inhomogeneous space-time for perfect fuid distribution with electromagnetic field is obtained in the context of normal gauge for Lyra's manifold. We have obtained solutions by considering the time dependent displacement field. We have also studied the time varying gravitational constant (G) which has many interesting consequences in astrophysics. G-varying cosmology is consistent with whatsoever cosmological observations available at present. The Newtonian constant of gravitation plays the role of a coupling constant between geometry and matter in the Einstein field equation. The large number hypothesis proposed by Dirac leads to a cosmology when G varies with time. The geometrical and physical behaviors of all models are also discussed. Moreover in my research we have investigated the e®ect of interaction between barotropic °uid and dark energy on the equation of state parameter in FRW space-time by considering a variable deceleration parameter.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Hassan, Amirhashchi
author_facet	Hassan, Amirhashchi
author_sort	Hassan, Amirhashchi
title	New Anisotropic Cosmological Models and Two-Fluid Energy Models
title_short	New Anisotropic Cosmological Models and Two-Fluid Energy Models
title_full	New Anisotropic Cosmological Models and Two-Fluid Energy Models
title_fullStr	New Anisotropic Cosmological Models and Two-Fluid Energy Models
title_full_unstemmed	New Anisotropic Cosmological Models and Two-Fluid Energy Models
title_sort	new anisotropic cosmological models and two-fluid energy models
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Science
publishDate	2011
url	http://psasir.upm.edu.my/id/eprint/19609/1/FS_2011_20x.pdf
_version_	1747811423611781120

New Anisotropic Cosmological Models and Two-Fluid Energy Models

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