Abstract
In this paper, we study stability of the Einstein static universe against inhomogeneous scalar perturbations parameterized by equation of state parameter in \(f(\mathcal{G},T)\) gravity (\(\mathcal{G}\) and \(T\) represent the Gauss-Bonnet invariant and trace of energy-momentum tensor, respectively). We formulate static as well as perturbed field equations in the presence of perfect fluid and analyze the stability regions. This is accomplished for particular \(f(\mathcal{G},T)\) models corresponding to zero as well as non-zero covariant divergence of the energy-momentum tensor. It is found that stable Einstein universe exists both for spatially closed as well as open universe models for suitable choice of parameters.
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Sharif, M., Ikram, A. Inhomogeneous perturbations and stability in \(f(\mathcal{G},T)\) gravity. Astrophys Space Sci 363, 178 (2018). https://doi.org/10.1007/s10509-018-3398-7
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DOI: https://doi.org/10.1007/s10509-018-3398-7