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dc.contributor.authorMurorunkwere, Beatrice
dc.contributor.authorNtahompagaze, Joseph
dc.contributor.authorJurua, Edward
dc.date.accessioned2022-10-25T12:56:06Z
dc.date.available2022-10-25T12:56:06Z
dc.date.issued2021
dc.identifier.citationMurorunkwere, B., Ntahompagaze, J., & Jurua, E. (2021). 1+ 3 covariant perturbations in power-law f (R) gravity. The European Physical Journal C, 81(4), 1-10.en_US
dc.identifier.urihttp://ir.must.ac.ug/xmlui/handle/123456789/2582
dc.description.abstractWe applied the 1+3 covariant approach around the Friedmann–Lemaître–Robertson–Walker (FLRW) background, together with the equivalence between f (R) gravity and scalar-tensor theory to study cosmological perturbations. We defined the gradient variables in the 1 + 3 covariant approach which we used to derive a set of evolution equations. Harmonic decomposition was applied to partial differential equations to obtain ordinary differential equations used to analyse the behavior of the perturbation quantities. We focused on dust dominated area and the perturbation equations were applied to background solution of αR +βRn model, n being a positive constant. The transformation of the perturbation equations into redshift dependence was done. After numerical solutions, it was found that the evolution of energy-density perturbations in a dust-dominated universe for different values of n decays with increasing redshift.en_US
dc.description.sponsorshipSwedish International Development Cooperation Agency (SIDAen_US
dc.language.isoen_USen_US
dc.publisherThe European Physical Journal Cen_US
dc.title1 + 3 covariant perturbations in power-law f(R) gravityen_US
dc.typeArticleen_US


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