• Stability analysis of LRS Bianchi type-$I$ cosmological model with varying $\varLambda$

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    • Keywords


      Locally rotationally symmetric Bianchi type-I Universe; cosmological constant; coupling parameter; dynamical systems; centre manifold theory.

    • Abstract


      In this paper, we deal with locally rotationally symmetric Bianchi type-$I$cosmological model with varying cosmological constant. Here, we have considered two models. In Model $I$, we have analysed total linear stability analysis for linear coupling between the dark sector of the Universe where as in Model $II$, the quadratic coupling between the dark sector of the Universe is considered. The cosmological history of the models is studied by finding all the critical points and analysing their local stability. We study the behaviour of all the critical points of the model when they are hyperbolic in nature using the linear Jacobi stability analysis and when they are non hyperbolic in nature using centre manifold theory. The perseverance of the equilibrium points is illustrated in phase portraits.

    • Author Affiliations



      1. Centre for Interdisciplinary Mathematical Sciences, Institute of Science, Banaras Hindu University, Varanasi 221 005, India
    • Dates

  • Pramana – Journal of Physics | News

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