On the LCDM Universe in f(R) gravity

Details On the LCDM Universe in f(R) gravity On the LCDM Universe in f(R) gravity

2010-05-12

arxiv.org/abs/1005.2205v3

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

7 pages, accepted for publication in PRD

Scientific paper

Several different explicit reconstructions of f(R) gravity are obtained from the background FRW expansion history. It is shown that the only theory whose Lagrangian is a simple function of the Ricci scalar R, that admits an exact LCDM expansion history is standard General Relativity with a positive cosmological constant and the only way to obtain this behaviour of the scale factor for more general functions of R is to add additional degrees of freedom to the matter sector.

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