Bianchi Type-I Space-Time with Variable Cosmological Constant

被引：13
|
作者：
Singh, C. P. [1 ]
Kumar, Suresh [1 ]
机构：
[1] Delhi Coll Engn, Dept Appl Math, Delhi 110042, India
来源：
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS | 2008年 / 47卷 / 12期
关键词：
Bianchi models; Cosmology; Deceleration parameter; Cosmological constant;
D O I：
10.1007/s10773-008-9752-8
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A spatially homogeneous and anisotropic Bianchi type-I perfect fluid model is considered with variable cosmological constant. Einstein's field equations are solved by using a law of variation for mean Hubble's parameter, which is related to average scale factor and that yields a constant value of deceleration parameter. An exact and singular Bianchi-I model is presented, where the cosmological constant remains positive and decreases with the cosmic time. It is found that the solutions are consistent with the recent observations of type Ia supernovae. A detailed study of physical and kinematical properties of the model is carried out.
引用
收藏
页码：3171 / 3179
页数：9
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