Bianchi Type I String Cosmological Models with Bulk Viscosity and Magnetic Field

Author： Wang Xing-Xiang  

Publisher： Springer Publishing Company

ISSN： 0004-640X

Source： Astrophysics and Space Science, Vol.293, Iss.4, 2004-10, pp. : 433-440

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Abstract

Some locally rotationally symmetric (LRS) Bianchi type I cosmological models for a cloud string with bulk viscosity and magnetic field are presented. Where an equation of state ρ=kλ and a relation between metric potential R=AS n are considered. The solution describes a shearing and nonrotating model with a big bang start. In the absence of magnetic field it reduces to a string model with bulk viscosity, where the relation between the coefficient of bulk viscosity and energy density is ζ∝ρ1/2. After choosing k= $$k = \frac{{1 + n}}{{1 - n}}$$ , it further reduces to a string model without viscosity and magnetic field.

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