Exact bianchi type-II, VIII and IX cosmological models in scale-covariant theory of gravitation

1993 ◽  
Vol 204 (1) ◽  
pp. 155-160 ◽  
Author(s):  
D. R. K. Reddy ◽  
B. M. Patrudu ◽  
R. Venkateswarlu
Keyword(s):  
Bianchi Type ◽  
Cosmological Models ◽  
Covariant Theory ◽  
Type Ii ◽  
Scale Covariant Theory ◽  
Viii And Ix ◽  
Theory Of Gravitation

Magnetized anisotropic dark energy cosmological models in scale covariant theory of gravitation

2014 ◽  
Vol 23 (07) ◽  
pp. 1450065 ◽  
Author(s):  
S. D. Katore ◽  
M. M. Sancheti ◽  
S. P. Hatkar
Keyword(s):  
Dark Energy ◽  
Bianchi Type ◽  
Covariant Theory ◽  
Type Ii ◽  
Field Equations ◽  
Scale Covariant Theory ◽  
Anisotropic Dark Energy ◽  
Expansion Scalar ◽  
Viii And Ix ◽  
Theory Of Gravitation

In the present paper, we have investigated Bianchi type II, VIII and IX spacetime in the presence of magnetized anisotropic dark energy in the Scale covariant theory of gravitation. Exact solution of the field equations are obtained by assuming the expansion anisotropy (the ratio of shear scalar to expansion scalar) to be a function of average scale factor. The isotropy of the fluid, space and expansion are examined.

Anisotropic Bianchi type-II modified holographic Ricci dark energy model in scale-covariant theory of gravitation

2021 ◽  
Author(s):  
Shri Ram ◽  
S. Chandel ◽  
M.K. Verma
Keyword(s):  
Dark Energy ◽  
Bianchi Type ◽  
Covariant Theory ◽  
Type Ii ◽  
Field Equations ◽  
Ricci Dark Energy ◽  
Scale Covariant Theory ◽  
Cosmological Observations ◽  
Negative Constant ◽  
Theory Of Gravitation

In this paper, we obtain an anisotropic Bianchi type-II space-time with dark matter and the modified holographic Ricci dark energy in the scale-covariant theory of gravitation. Exact solutions of the field equations are obtained by assuming (I) a negative constant value of the deceleration parameter (II) the component σ<sup>1</sup><sub>1</sub> of the shear tensor σ<sup>j</sup><sub>i</sub> is proportional to the mean Hubble parameter and (III) the gauge function Φ is proportional to a power function of the average scale factor. We have also discussed some important physical aspects of the model which is in agreement with the modern cosmological observations.

scholarly journals Bianchi Type II, VIII, and IX Perfect Fluid Dark Energy Cosmological Models in Saez-Ballester and General Theory of Gravitation

2013 ◽  
Vol 2013 ◽  
pp. 1-11
Author(s):  
V. U. M. Rao ◽  
K. V. S. Sireesha ◽  
D. Neelima
Keyword(s):  
Dark Energy ◽  
Perfect Fluid ◽  
Bianchi Type ◽  
Cosmological Models ◽  
Type Ii ◽  
Geometrical Features ◽  
Viii And Ix ◽  
Theory Of Gravitation ◽  
Spatially Homogeneous ◽  
Einstein’S General Relativity

The paper deals with spatially homogeneous anisotropic Bianchi type II, VIII , and IX dark energy cosmological models filled with perfect fluid in the framework of Saez-Ballester (1986) theory, and Einstein's general relativity. Assuming that the two sources interact minimally and therefore their energy momentum tensors are conserved separately, we have considered different cases and presented anisotropic as well as isotropic cosmological models. Some important physical and geometrical features of the models, thus obtained, have been discussed.

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
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