Massive cosmic strings in Bianchi type II

Details Massive cosmic strings in Bianchi type II Massive cosmic strings in Bianchi type II

2009-03-27

arxiv.org/abs/0903.4757v1

Astrophys. Space Sci. 323, 307, (2009)

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

7 pages, RevTeX

Scientific paper

We study a massive cosmic strings with BII symmetries cosmological models in two contexts. The first of them is the standard one with a barotropic equation of state. In the second one we explore the possibility of taking into account variable \textquotedblleft constants\textquotedblright ($G$ and $\Lambda ).$Both models are studied under the self-similar hypothesis. We put special emphasis in calculating the numerical values for the equations of state. We find that for $\omega\in(0,1]$, $G$, is a growing time function while $\Lambda$, behaves as positive decreasing time function. If $\omega=0,$ both \textquotedblleft constants\textquotedblright, $G$ and $\Lambda,$ behave as true constants.

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