Modified Friedmann Equations in R$^{-1}$-Modified Gravity

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  • 19 July 2003
Abstract
Recently, corrections to Einstein-Hilbert action that become important at small curvature are proposed. We discuss the first order and second order approximations to the field equations derived by the Palatini approach. We work out the first and second order Modified Friedmann equations and present the valid upper redshift bounds when these approximations is valid. We show that the second order effects can be neglected on the cosmological predictions involving only the Hubble parameter itself, e.g. the various cosmological distances, but the second order effects can not be neglected in the predictions involved the derivatives of the Hubble parameter. Furthermore, the Modified Friedmann equations fit the SN Ia data at an acceptable level.

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