Palatini f(R) Cosmology

Details Palatini f(R) Cosmology Palatini f(R) Cosmology

2008-01-30

arxiv.org/abs/0801.4606v1

Mod.Phys.Lett.A23:1388-1396,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, CosPA 2007 Proceeding will be published in the Mod. Phys. Lett. A

Scientific paper

10.1142/S021773230802776X

We investigate the modified gravity theories in terms of the effective dark energy models. We compare the cosmic expansion history and the linear growth in different models. We also study the evolution of linear cosmological perturbations in modified theories of gravity assuming the Palatini formalism. We find the stability of the superhorizon metric evolution depends on models. We also study the matter density fluctuation in the general gauge and show the differential equations in super and sub-horizon scales.

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