Shear dynamics in Bianchi I cosmologies with Rn-gravity

被引:81
作者
Leach, Jannie A. [1 ]
Carloni, Sante
Dunsby, Peter K. S.
机构
[1] Univ Cape Town, Dept Math & Appl Math, ZA-7701 Rondebosch, South Africa
[2] S African Astron Observ, ZA-7935 Cape Town, South Africa
关键词
D O I
10.1088/0264-9381/23/15/011
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We give the equations governing the shear evolution in Bianchi spacetimes for general f ( R) theories of gravity. We consider the case of R-n-gravity and perform a detailed analysis of the dynamics in Bianchi I cosmologies which exhibit local rotational symmetry. We find exact solutions and study their behaviour and stability in terms of the values of the parameter n. In particular, we found a set of cosmic histories in which the universe is initially isotropic, then develops shear anisotropies which approach a constant value.
引用
收藏
页码:4915 / 4937
页数:23
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