A BIANCHI TYPE-II DARK-ENERGY COSMOLOGY WITH A DECAYING Λ-TERM IN THE BRANS-DICKE THEORY OF GRAVITY

被引：4
作者：
Singh, J. K. [1 ]
Sharma, N. K. [1 ]
Beesham, A. [2 ]
机构：
[1] Univ Delhi, Fac Technol, Netaji Subhas Inst Technol, Dept Math, Delhi, India
[2] Univ Zululand, Dept Math Sci, Mhlatuze, South Africa
来源：
THEORETICAL AND MATHEMATICAL PHYSICS | 2017年 / 193卷 / 03期
关键词：
Bianchi type-II space-time; anisotropic dark energy; Brans-Dicke theory of gravity; equation of state parameter; Lambda-term; PROBE WMAP OBSERVATIONS; SUPERNOVA DATA; BULK VISCOSITY; MODELS; CONSTRAINTS; UNIVERSE; OMEGA(LAMBDA); OMEGA(M); MAPS;
D O I：
10.1134/S0040577917120121
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We present a sequence of anisotropic Bianchi type-II dark-energy models in the framework of the Brans-Dicke theory of gravity with a variable equation of state (EoS) parameter and a constant deceleration parameter. We use power-law relations between the scalar field phi and the scale factor A and between the average Hubble parameter H and the average scale factor A to obtain most of the analytic solutions. The dark-energy EoS parameter omega and its range admitted by the models agrees well with the most recent observational data. It has been observed that the cosmological constant. is decreasing with time, which is consistent with recent cosmological observations. We study the dynamical stability and physical features of the models.
引用
收藏
页码：1865 / 1879
页数：15
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