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Cosmological evolution in 1/R-gravity theory

Xin He Meng1,2 and Peng Wang1

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Recently, corrections of the L(R) type to Einstein–Hilbert action that become important at small curvature have been proposed. These type of models are intended to explain the observed cosmic acceleration without dark energy. We derive the full modified Friedmann equation in the Palatini formulation of these modified gravity models of the L(R) type. Then, we discuss various cosmological predictions of the modified Friedmann equation.


PACS

98.80.Es Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc)

95.30.Sf Relativity and gravitation

MSC

83F05 Cosmology

Subjects

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 4 (21 February 2004)

Received 22 September 2003

Published 14 January 2004



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