Cosmological Models with Variable Gravitational and Cosmological constants in $R^{2}$ Gravity

Details Cosmological Models with Variable Gravitational and Cosmological constants in $R^{2}$ Gravity Cosmological Models with Variable Gravitational and Cosmological constants in $R^{2}$ Gravity

2005-08-09

arxiv.org/abs/gr-qc/0508031v2

Int.J.Mod.Phys. D15 (2006) 189-198

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, no figure. to be published in Int. J. Mod. Phys. D

Scientific paper

10.1142/S0218271806007687

We consider the evolution of a flat Friedmann-Roberstson-Walker Universe in a higher derivative theories, including $\alpha R^{2}$ terms to the Einstein-Hilbert action in the presence of a variable gravitational and cosmological constants. We study here the evolution of the gravitational and cosmological constants in the presence of radiation and matter domination era of the universe. We present here new cosmological solutions which are physically interesting for model building.

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