Anisotropic cosmological models with bulk viscosity and particle creation in Saez–Ballester theory of gravitation

Pramana ◽  
2015 ◽  
Vol 86 (3) ◽  
pp. 681-699
Author(s):  
S CHANDEL ◽  
SHRI RAM
Keyword(s):  
Bulk Viscosity ◽  
Particle Creation ◽  
Cosmological Models ◽  
Anisotropic Cosmological Models ◽  
Theory Of Gravitation

Anisotropic cosmological models in f (R, T) theory of gravitation

Pramana ◽  
2013 ◽  
Vol 81 (1) ◽  
pp. 67-74 ◽  
Author(s):  
SHRI RAM ◽  
PRIYANKA ◽  
MANISH KUMAR SINGH
Keyword(s):  
Cosmological Models ◽  
Anisotropic Cosmological Models ◽  
Theory Of Gravitation

scholarly journals Bianchi Types II, VIII, and IX String Cosmological Models with Bulk Viscosity in a Theory of Gravitation

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
V. U. M. Rao ◽  
K. V. S. Sireesha ◽  
M. Vijaya Santhi
Keyword(s):  
Cosmological Model ◽  
Bulk Viscosity ◽  
Bianchi Type ◽  
Cosmological Models ◽  
Geometrical Properties ◽  
Viii And Ix ◽  
Theory Of Gravitation ◽  
Spatially Homogeneous ◽  
Bianchi Types

We have obtained and presented spatially homogeneous Bianchi types II, VIII, and IX string cosmological models with bulk viscosity in a theory of gravitation proposed by Sen (1957) based on Lyra (1951) geometry. It is observed that only vacuum cosmological model exists in case of Bianchi type IX universe. Some physical and geometrical properties of the models are also discussed.

scholarly journals Axially Symmetric Bulk Viscous String Cosmological Models in GR and Brans-Dicke Theory of Gravitation

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
V. U. M. Rao ◽  
D. Neelima
Keyword(s):  
General Relativity ◽  
Bulk Viscosity ◽  
Space Time ◽  
Cosmological Models ◽  
Axially Symmetric ◽  
Matter Distribution ◽  
Field Equations ◽  
Theory Of Gravitation ◽  
The Universe ◽  
Special Case

Axially symmetric string cosmological models with bulk viscosity in Brans-Dicke (1961) and general relativity (GR) have been studied. The field equations have been solved by using the anisotropy feature of the universe in the axially symmetric space-time. Some important features of the models, thus obtained, have been discussed. We noticed that the presence of scalar field does not affect the geometry of the space-time but changes the matter distribution, and as a special case, it is always possible to obtain axially symmetric string cosmological model with bulk viscosity in general relativity.

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