The Decoupling of Scalar-Modes from a Linearly Perturbed Dust-Filled Bianchi Type-I Model  

作　　者：Bob Osano 

机构地区：[1]Cosmology and Gravity Group, Department of Mathematics and Applied Mathematics, University of Cape Town, Rondebosch, 7701, South Africa

出　　处：《Chinese Physics Letters》2014年第1期21-24,共4页中国物理快报（英文版）

摘　　要：We study linear perturbations about a dust filled Bianchi type-I model with the vorticity set to zero. In comparisonto linear perturbations about the Friedmann-Lemaitre Robertson Walker models, modes of perturbations about the Bianchi type-I models are coupled. We find that the tensor that represents the background shear needs to be degenerate in order for the scalar-mode perturbations to decouple from the rest of the flow.We study linear perturbations about a dust filled Bianchi type-I model with the vorticity set to zero. In comparisonto linear perturbations about the Friedmann-Lemaitre Robertson Walker models, modes of perturbations about the Bianchi type-I models are coupled. We find that the tensor that represents the background shear needs to be degenerate in order for the scalar-mode perturbations to decouple from the rest of the flow.

分 类 号：O212.1[理学—概率论与数理统计] TM131[理学—数学]