scholarly journals Anisotropic Cosmological Models with a Perfect Fluid and a Λ Term

2006 ◽  
Vol 302 (1-4) ◽  
pp. 83-91 ◽  
Author(s):  
Bijan Saha
Keyword(s):  
Perfect Fluid ◽  
Cosmological Models ◽  
Anisotropic Cosmological Models

scholarly journals Anisotropic cosmological models in Horndeski gravity

2021 ◽  
Vol 103 (10) ◽  
Author(s):  
Rafkat Galeev ◽  
Ruslan Muharlyamov ◽  
Alexei A. Starobinsky ◽  
Sergey V. Sushkov ◽  
Mikhail S. Volkov
Keyword(s):  
Cosmological Models ◽  
Anisotropic Cosmological Models

Anisotropic cosmological models in terms of Raychaudhuri and Wheeler-DeWitt equations

2009 ◽  
Vol 15 (2) ◽  
pp. 148-150
Author(s):  
M. L. Fil’chenkov ◽  
R. Kh. Saibatalov ◽  
Yu. P. Laptev ◽  
V. V. Plotnikov
Keyword(s):  
Cosmological Models ◽  
Anisotropic Cosmological Models

scholarly journals Bianchi Type-II, VIII & IX Perfect Fluid Cosmological Models in Brans Dicke Theory of Gravitation

2011 ◽  
Vol 02 (10) ◽  
pp. 1222-1228 ◽  
Author(s):  
Velagapudi Uma Maheswara Rao ◽  
Mandangi Vijaya Santhi
Keyword(s):  
Perfect Fluid ◽  
Bianchi Type ◽  
Cosmological Models ◽  
Type Ii ◽  
Theory Of Gravitation

scholarly journals Equivalence of Einstein and Jordan frames in quantized anisotropic cosmological models

2018 ◽  
Vol 393 ◽  
pp. 93-106 ◽  
Author(s):  
Sachin Pandey ◽  
Sridip Pal ◽  
Narayan Banerjee
Keyword(s):  
Cosmological Models ◽  
Anisotropic Cosmological Models

scholarly journals Anisotropic cosmological reconstruction in f(R, T) gravity

2018 ◽  
Vol 33 (29) ◽  
pp. 1850170 ◽  
Author(s):  
B. Mishra ◽  
Sankarsan Tarai ◽  
S. K. Tripathy
Keyword(s):  
Simple Approach ◽  
Cosmological Models ◽  
Gravity Theory ◽  
Cosmic Acceleration ◽  
Late Time ◽  
Coupling Constant ◽  
Anisotropic Cosmological Models

Anisotropic cosmological models are constructed in f(R, T) gravity theory to investigate the dynamics of universe concerning the late time cosmic acceleration. Using a more general and simple approach, the effect of the coupling constant and anisotropy on the cosmic dynamics have been investigated. In this study, it is found that cosmic anisotropy substantially affects cosmic dynamics.

String inspired cosmological models through Lagrangian invariance

2020 ◽  
Vol 17 (06) ◽  
pp. 2050085
Author(s):  
José Antonio Belinchón ◽  
Danae Polychroni
Keyword(s):  
Perfect Fluid ◽  
Power Law ◽  
Matter Field ◽  
Scale Factor ◽  
Cosmological Models ◽  
De Sitter ◽  
Text Field ◽  
Duality Property ◽  
Constant Potential ◽  
Variable Potential

We study a string inspired cosmological with variable potential through the Lagrangian invariance method in order to determine the form of the potential. We have studied four cases by combining the different fields, that is, the dilaton [Formula: see text] the potential [Formula: see text] the [Formula: see text]-field and the matter field (a perfect fluid). In all the studied cases, we found that the potential can only take two possible forms: [Formula: see text] and [Formula: see text] where [Formula: see text] and [Formula: see text] are numerical constants. We conclude that when we take into account the Kalb–Ramond field, i.e. the [Formula: see text]-field, then it is only possible to get a constant potential, [Formula: see text] Nevertheless, if this field is not considered, then we get two possible solutions for the potential: [Formula: see text] and [Formula: see text] In all the cases, if the potential is constant, [Formula: see text] then we get a de Sitter like solution for the scale factor of the metric, [Formula: see text], which verifies the [Formula: see text]-duality property, while if the potential varies, then we get a power-law solution for the scale factor, [Formula: see text] [Formula: see text]

Sign in / Sign up

Export Citation Format

Share Document