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Bianchi Type-III String Cosmological Model with Bulk Viscosity in General Relativity |
| WANG Xing-Xiang |
| Department of Physics, Anhui Normal University, Wuhu 241000 |
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| Cite this article: |
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WANG Xing-Xiang 2005 Chin. Phys. Lett. 22 29-32 |
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Abstract The Bianchi type-III cosmological model for a cloud string with bulk viscosity are studied. To obtain a determinate solution, it is assumed that the coefficient of bulk viscosity is a power function of the
scalar of expansion zeta = kθm and the shear scalar is proportional to scalar of expansion σ ∝ θ, which leads to the relation between metric potentials B = Cn. The physical features of the model are also discussed. It is found that the power index m has significant influence on the string model. There is a ``big bang'' start in the model when m≤1 but there is no the big-bang start when m > 1. In the special case m = 0, the model reduces to the string model of constant coefficient of bulk viscosity that was the result previously given in the literature.
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04.20.Jb
98.80.Cq
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Published: 01 January 2005
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| PACS: |
04.20.Jb
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(Exact solutions)
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98.80.Cq
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(Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.))
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