Article

Accelerating Universe with a Special Form of Decelerating Parameter

International Journal of Theoretical Physics (impact factor: 0.85). 01/2009; 48(2):351-356. DOI:10.1007/s10773-008-9807-x pp.351-356

ABSTRACT In this article, we try to investigate the quintessence model with a minimally coupled scalar field by taking a special form
of decelerating parameter q in such a way that which provides an early deceleration and late time acceleration for barotropic fluid and Chaplygin gas
dominated models. We have shown that the potential function V(φ) is always decreases with the scalar field φ for barotropic and Chaplygin both models. The {r,s} diagram shows the behaviour of the universe in different stages during the evolution.

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Keywords

barotropic
 
barotropic fluid
 
Chaplygin gas
 
models
 
quintessence model
 
scalar field
 
scalar field φ
 
special form
 
time acceleration
 

Anup Kumar Singha