scholarly journals On the Validity of the Cosmic No-hair Conjecture in some Conformal-violating Maxwell Models

2019 ◽  
Vol 35 (2) ◽  
Author(s):  
Do Quoc Tuan
Keyword(s):  
Bianchi Type ◽  
Space Time ◽  
Kinetic Term ◽  
Type I ◽  
Anisotropic Space ◽  
Maxwell Theory ◽  
Bianchi Type I ◽  
Cosmic Inflation ◽  
Cosmological Solutions ◽  
Maxwell Models

Abstract: We will present main results of our recent investigations on the validity of the cosmic no-hair conjecture proposed by Hawking and his colleagues in some conformal-violating Maxwell models, in which a scalar field or its kinetic term is non-trivially coupled to the electromagnetic field. In particular, we will show that the studied models really admit the Bianchi type I metrics, which are homogeneous but anisotropic space time, as their stable cosmological solutions. Hence, these models turn out to be counterexamples to the cosmic no-hair conjecture. Keywords: Cosmic no-hair conjecture, cosmic inflation, Bianchi type I space time, Maxwell theory.

scholarly journals de Sitter expansion with anisotropic fluid in Bianchi type-I space-time

2010 ◽  
Vol 326 (2) ◽  
pp. 315-322 ◽  
Author(s):  
Özgür Akarsu ◽  
Can Battal Kılınç
Keyword(s):  
Bianchi Type ◽  
Space Time ◽  
Anisotropic Fluid ◽  
Type I ◽  
De Sitter ◽  
Bianchi Type I

scholarly journals Higher Dimensional Bianchi Type-I Cosmological Models With Massive String in General Relativity

2021 ◽  
Vol 8 ◽  
Author(s):  
Kangujam Priyokumar Singh ◽  
Jiten Baro ◽  
Asem Jotin Meitei
Keyword(s):  
General Relativity ◽  
Bianchi Type ◽  
Early Stage ◽  
Dimensional Space ◽  
Space Time ◽  
Cosmological Models ◽  
Type I ◽  
Bianchi Type I ◽  
Geometrical Properties ◽  
Dimensional Space Time

Here we studied Bianchi type-I cosmological models with massive strings in general relativity in five dimensional space time. Out of the two different cases obtained here, one case leads to a five dimensional Bianchi type-I string cosmological model in general relativity while the other yields the vacuum Universe in general relativity in five dimensional space time. The physical and geometrical properties of the model Universe are studied and compared with the present day’s observational findings. It is observed that our model is anisotropic, expanding, shearing, and decelerates at an early stage and then accelerates at a later time. The model expands along x, y, and z axes and the extra dimension contracts and becomes unobservable at t → ∞. We also observed that the sum of the energy density (ρ) and the string tension density (λ) vanishes (ρ + λ = 0).

scholarly journals Approximate Solutions of the LRS Bianchi Type-I Cosmological Model

Symmetry ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 403
Author(s):  
Yihu Feng ◽  
Lei Hou
Keyword(s):  
Cosmological Model ◽  
Homotopy Perturbation Method ◽  
Bianchi Type ◽  
Approximate Solutions ◽  
Space Time ◽  
Type I ◽  
Main Field ◽  
Field Equations ◽  
Bianchi Type I ◽  
Homotopy Perturbation

In this current study, we explore the modified homogeneous cosmological model in the background of LRS Bianchi type-I space–time. For this purpose, we employ the Homotopy Perturbation Method (HPM). HPM is an analytical-based method. Further, we calculated the main field equations of the cosmological model LRS Bianchi type-I space–time. Furthermore, we discuss the necessary calculations of HPM. Therefore, we investigate the analytical solution of our problem by adopting HPM. In this response, we discuss five different values of parameter n. We also give a brief discussion about solutions. The main purpose of this study is to apply the application of HPM in the cosmological field.

Massive scalar field in the Bianchi Type I space time

2003 ◽  
Vol 288 (4) ◽  
pp. 523-529 ◽  
Author(s):  
G. Mohanty ◽  
S.K. Sahu ◽  
P.K. Sahoo
Keyword(s):  
Scalar Field ◽  
Bianchi Type ◽  
Space Time ◽  
Type I ◽  
Massive Scalar ◽  
Massive Scalar Field ◽  
Bianchi Type I
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