Massive cosmic strings in Bianchi type II

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 $Λ).$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 $ω\in(0,1]$, $G$, is a growing time function while $Λ$, behaves as positive decreasing time function. If $ω=0,$ both \textquotedblleft constants\textquotedblright, $G$ and $Λ,$ behave as true constants.

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