Kantowski-Sachs String Cosmological Model with Bulk Viscosity In General Relativity

Details Kantowski-Sachs String Cosmological Model with Bulk Viscosity In General Relativity Kantowski-Sachs String Cosmological Model with Bulk Viscosity In General Relativity

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ap%26ss.298..433w&link_type=abstract

Astrophysics and Space Science, Volume 298, Issue 3, pp.433-440

Mathematics

Logic

4

String Cosmological Model, Kantowski-Sachs Space-Time, Bulk Viscosity

Scientific paper

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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