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Shear-free anisotropic cosmological models in f(R) gravity

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dc.contributor.author Abebe, Amare
dc.contributor.author Momeni, Davood
dc.contributor.author Myrzakulov, Ratbay
dc.date.accessioned 2024-03-29T05:36:32Z
dc.date.available 2024-03-29T05:36:32Z
dc.date.issued 2016
dc.identifier.issn 0001-7701
dc.identifier.other DOI 10.1007/s10714-016-2046-1
dc.identifier.uri http://rep.enu.kz/handle/enu/13136
dc.description.abstract We study a class of shear-free, homogeneous but anisotropic cosmological models with imperfect matter sources in the context of f (R) gravity. We show that the anisotropic stresses are related to the electric part of the Weyl tensor in such a way that they balance each other. We also show that within the class of orthogonal f (R) models, small perturbations of shear are damped, and that the electric part of the Weyl tensor and the anisotropic stress tensor decay with the expansion as well as the heat flux of the curvature fluid. Specializing in locally rotationally symmetric spacetimes in orthonormal frames, we examine the late-time behaviour of the de Sitter universe in f (R) gravity. For the Starobinsky model of f (R), we study the evolutionary behavior of the Universe by numerically integrating the Friedmann equation, where the initial conditions for the expansion, acceleration and jerk parameters are taken from observational data. ru
dc.language.iso en ru
dc.publisher General Relativity and Gravitation ru
dc.relation.ispartofseries 48;49
dc.subject Shear-free spacetimes ru
dc.subject Homogeneity ru
dc.subject Cosmic anisotropy ru
dc.subject Modified gravity ru
dc.subject Expansion ru
dc.subject Inflation ru
dc.subject Cosmological perturbations ru
dc.title Shear-free anisotropic cosmological models in f(R) gravity ru
dc.type Article ru


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