Astrophysics and Space Science

, Volume 298, Issue 3, pp 433–440

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

Article

DOI: 10.1007/s10509-005-5833-9

Cite this article as:
Wang, XX. Astrophys Space Sci (2005) 298: 433. doi:10.1007/s10509-005-5833-9

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 = ASn. 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.

Keywords

string cosmological modelKantowski-Sachs space-timebulk viscosity

Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  1. 1.Department of PhysicsAnhui Normal UniversityWuhuP.R.China