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Non Existence of Shear in Bianchi Type-III String Cosmological Models with Bulk Viscosity and Time−Dependent Λ Term |
| R. K. Tiwari1, Sonia Sharma2**
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1Department of Mathematics, Govt. Model Science College, Rewa (MP), India
2Department of Mathematics, Rayat Polytechnic College, Ropar (Punjab), India
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| Cite this article: |
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R. K. Tiwari, Sonia Sharma 2011 Chin. Phys. Lett. 28 020401 |
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Abstract We study the non existence of shear in locally rotationally symmetric Bianchi type-III string cosmological models with bulk viscosity and variable cosmological term Λ. Exact solutions of the field equations are obtained by assuming the conditions: the bulk viscosity is proportional to the expansion scalar, ξ∝θ, expansion scalar is proportional to shear scalar, θ∝σ, and Λ is proportional to the Hubble parameter. The coefficient of bulk viscosity is assumed to be a power function of mass density. The corresponding physical interpretations of the cosmological solutions are also discussed.
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04.20.Jb
98.80.Cq
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Received: 26 October 2010
Published: 30 January 2011
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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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