Power-law cosmic expansion in f(R) gravity models

Abstract

We show that within the class of f(R) gravity theories, FLRW power-law perfect fluid solutions only exist for R^n gravity. This significantly restricts the set of exact cosmological solutions which have similar properties to what is found in standard General Relativity.

4 pages, 2 figures

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Cited by in corpus (3)

• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• Robust approach to f(R) gravity
• R^n gravity and the chameleon