scholarly journals Bianchi type-II cosmological model with viscous fluid

1986 ◽  
Vol 18 (5) ◽  
pp. 461-477 ◽  
Author(s):  
A. Banerjee ◽  
S. B. Duttachoudhury ◽  
Abhik Kumar Sanyal
Keyword(s):  
Cosmological Model ◽  
Viscous Fluid ◽  
Bianchi Type ◽  
Type Ii

A rotating Bianchi type II viscous fluid cosmological model with heat flux

1990 ◽  
Vol 67 (3-4) ◽  
pp. 297-304
Author(s):  
Sharda S. Koppar ◽  
L. K. Patel
Keyword(s):  
Heat Flux ◽  
Cosmological Model ◽  
Viscous Fluid ◽  
Bianchi Type ◽  
Type Ii

Locally rotationally symmetric (LRS) Bianchi type II string dust viscous fluid cosmological models in Lyra geometry

2014 ◽  
Vol 92 (12) ◽  
pp. 1714-1719 ◽  
Author(s):  
Raj Bali ◽  
Mahesh Kumar Yadav ◽  
Lokesh Kumar Gupta
Keyword(s):  
Cosmological Model ◽  
Viscous Fluid ◽  
Bulk Viscosity ◽  
Bianchi Type ◽  
Displacement Vector ◽  
Lyra Geometry ◽  
Type Ii ◽  
Locally Rotationally Symmetric ◽  
Rotationally Symmetric ◽  
The Universe

In the present study, a locally rotationally symmetric Bianchi type II string dust cosmological model with varying bulk viscosity in the framework of Lyra geometry is investigated. To get the deterministic solution, we have assumed that shear (σ) is proportional to the expansion (θ) and ζθ = constant, where ζ is the coefficient of bulk viscosity. The ansatz ζθ = constant, was found to coincide with the occurrence of Little Rip (LR) cosmology using Friedmann–Robertson–Walker metric (Breviket al. Phys. Rev. D, 84, 103508-1-6 (2011)). The model describes the pre-inflationary stage of the universe. The presence of viscosity leads to inflationary-like solutions. Anisotropy is maintained because of the presence of strings. The presence of bulk viscosity prevents the matter density from vanishing. In a special case, the model represents the isotropy of the universe. The universe passes through a decelerating stage to an accelerating phase, which is in agreement with Ries et al.’s (Astrophys. J. 607, 665 (2004). doi:10.1086/383612 ) type Ia supernovae astronomical observations. The displacement vector (β) of Lyra geometry is a decreasing function of time analogous to the cosmological constant (Λ) of general relativity. We have attempted to explore the possibility of constructing a string dust viscous fluid cosmological model in Bianchi type II space–time with displacement vector (β) in Lyra geometry using the geometric condition that shear is proportional to expansion.

scholarly journals A General Bianchi Type Viscous Fluid Cosmological Model with Both Deceleration and Acceleration

2016 ◽  
Vol 1 (2) ◽  
Author(s):  
Shri Ram ◽  
◽  
S. Chandel ◽  
M. K. Verma ◽  
◽  
...  
Keyword(s):  
Cosmological Model ◽  
Viscous Fluid ◽  
Bianchi Type

LRS Bianchi Type-II Cosmological Model with a Decaying Lambda Term

2012 ◽  
Vol 29 (1) ◽  
pp. 010403 ◽  
Author(s):  
R. K. Tiwari ◽  
D. Tiwari ◽  
Pratibha Shukla
Keyword(s):  
Cosmological Model ◽  
Bianchi Type ◽  
Type Ii

A Bianchi Type II Cosmological Model with Rotation and Dark Energy

2014 ◽  
Vol 57 (3) ◽  
pp. 418-421 ◽  
Author(s):  
E. V. Kuvschinova ◽  
V. F. Panov
Keyword(s):  
Dark Energy ◽  
Cosmological Model ◽  
Bianchi Type ◽  
Type Ii
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