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• W4288045602 endingPage "169058" @default.
• W4288045602 startingPage "169058" @default.
• W4288045602 abstract "The Einstein static (ES) state is a good candidate for describing the very early universe in terms of a regular cosmological model in which the Big Bang singularity is avoided. In the present study we propose an ES solution in the framework of generalized Rastall gravity (GRG), a modified version of original Rastall theory in which the coupling parameter is allowed to vary with respect to the spacetime coordinates. Introducing an ansatz for the Rastall parameter, existence and the corresponding stability of the solutions are investigated. We show that the GRG is capable of describing a stable singularity-free state for the universe. The problem of transition from an ES to an inflationary state is also addressed. We find that a time variation of the equation of state parameter from values lying in the range |w|<1/3 to the value w=-1/3 can give rise to such a phase transition. The vector and tensor perturbations around the ES solution are studied, as well. In the case of GRG, the vector perturbations remain frozen, nevertheless, the tenor perturbations can grow in such a way that the ES solution remains stable provided the ratio of Rastall gravitational constant to the Einsteinian one always exceeds a minimum value for each tensor mode." @default.
• W4288045602 created "2022-07-27" @default.
• W4288045602 creator A5029714543 @default.
• W4288045602 creator A5048646658 @default.
• W4288045602 creator A5077800151 @default.
• W4288045602 date "2022-09-01" @default.
• W4288045602 modified "2023-09-26" @default.
• W4288045602 title "Einstein static universe and its stability in generalized Rastall gravity" @default.
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• W4288045602 doi "https://doi.org/10.1016/j.aop.2022.169058" @default.
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