The general class of Bianchi cosmological models with dark energy and variable $Lambda$ and $G$ in viscous cosmology

Pramana

A K SHUKLA¹  RAKESH RAUSHAN¹  R CHAUBEY1¹ 

[1] DST-Centre for Interdisciplinary Mathematical Sciences, Institute of Science, Banaras Hindu University, Varanasi, India$$

关键词: Dark energy;    bulk viscosity;    cosmological constant;    cosmological parameter;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

The general class of Bianchi cosmological models with dark energy in the form of modified Chaplygin gas with variable $Lambda$ and $G$ and bulk viscosity have been considered. We discuss three types of average scalefactor by using a special law for deceleration parameter which is linear in time with negative slope. The exact solutions to the corresponding field equations are obtained. We obtain the solution of bulk viscosity ($xi$ ), cosmologicalconstant ($Lambda$), gravitational parameter ($G$) and deceleration parameter ($q$) for different equations of state. The model describes an accelerating Universe for large value of time $t$ , wherein the effective negative pressure induced by Chaplygin gas and bulk viscous pressure are driving the acceleration.

【 授权许可】

Unknown