R^n gravity and the chameleon

Abstract

The Solar System bounds on R^n gravity are often ignored in the literature by invoking the chameleon mechanism. We show that in order for the latter to work, the exponent n must be ridicolously close to unity and, therefore, these theories are severely constrained.

5 pages, latex, 1 figure, to appear in Phys. Rev. D

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• The future of gravitational theories in the era of the gravitational wave astronomy
• About matter and dark-energy domination eras in R^n gravity or lack thereof
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• Perfect fluid solutions of Brans-Dicke and f(R)cosmology
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• Generalized derivations and general relativity
• Exact analytical vacuum solutions of $R^n$-gravity model depending on two variables
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