Abstract
String cosmological models with bulk viscosity are investigated in Kantowski-Sachs space-time. To obtain a determinate solution, it is assumed that the coefficient of bulk viscosity is a power function of the scalar of expansion ζ = kθm and the scalar of expansion is proportional to the shear scalar θ ∝ σ, which leads to a relation between metric potentials R = AS n. The physical and geometrical aspects of the model are also discussed. It is shown that the bulk viscosity has significant influence on the evolution of the universe. There is a ‘big bang’ start in the model when m ≤ 1 but there is no ‘big bang’ start when m > 1.
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Wang, XX. Kantowski-Sachs String Cosmological Model with Bulk Viscosity In General Relativity. Astrophys Space Sci 298, 433–440 (2005). https://doi.org/10.1007/s10509-005-5833-9
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DOI: https://doi.org/10.1007/s10509-005-5833-9