Accelerating dark energy cosmological model in two fluids with hybrid scale factor

被引:22
作者
Mishra, B. [1 ]
Sahoo, P. K. [1 ]
Ray, Pratik P. [1 ]
机构
[1] Birla Inst Technol & Sci Pilani, Dept Math, Hyderabad Campus, Hyderabad 500078, Andhra Pradesh, India
关键词
Accelerating universe; cosmic string; density parameter; two fluid; general relativity; CONSTRAINTS; PARAMETERS; LAMBDA; OMEGA(LAMBDA); SUPERNOVAE; ANISOTROPY; OMEGA(M); EQUATION; UNIVERSE; AGE;
D O I
10.1142/S0219887817501249
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
In this paper, we have investigated the anisotropic behavior of the accelerating universe in Bianchi V spacetime in the framework of General Relativity (GR). The matter field we have considered is of two non-interacting fluids, i.e. the usual string fluid and dark energy (DE) fluid. In order to represent the pressure anisotropy, the skewness parameters are introduced along three different spatial directions. To achieve a physically realistic solutions to the field equations, we have considered a scale factor, known as hybrid scale factor, which is generated by a time-varying deceleration parameter. This simulates a cosmic transition from early deceleration to late time acceleration. It is observed that the string fluid dominates the universe at early deceleration phase but does not affect nature of cosmic dynamics substantially at late phase, whereas the DE fluid dominates the universe in present time, which is in accordance with the observations results. Hence, we analyzed here the role of two fluids in the transitional phases of universe with respect to time which depicts the reason behind the cosmic expansion and DE. The role of DE with variable equation of state parameter (EoS) and skewness parameters, is also discussed along with physical and geometrical properties.
引用
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页数:15
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