Chin. Phys. Lett.  2014, Vol. 31 Issue (1): 010402    DOI: 10.1088/0256-307X/31/1/010402
GENERAL |
The Decoupling of Scalar-Modes from a Linearly Perturbed Dust-Filled Bianchi Type-I Model
Bob Osano**
Cosmology and Gravity Group, Department of Mathematics and Applied Mathematics, University of Cape Town, Rondebosch, 7701, South Africa
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Bob Osano 2014 Chin. Phys. Lett. 31 010402
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Abstract We study linear perturbations about a dust filled Bianchi type-I model with the vorticity set to zero. In comparison to linear perturbations about the Friedmann–Lema?tre–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.
Received: 22 August 2013      Published: 28 January 2014
PACS:  04.20.Ex (Initial value problem, existence and uniqueness of solutions)  
  04.20.-q (Classical general relativity)  
  98.80.Jk (Mathematical and relativistic aspects of cosmology)  
  98.80.-k (Cosmology)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/31/1/010402       OR      https://cpl.iphy.ac.cn/Y2014/V31/I1/010402
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