Violation of the equivalence principle in modified theories of gravity

We show that the metric in f(R) theories of gravity in Palatini formalism can be solved as the product of a rank-two tensor times a scalar function which is very sensitive to the local energy-momentum densities. This local dependence of the metric generates new gravitationally-induced microscopic in...

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Bibliographic Details
Published in:Physical review letters 2007-02, Vol.98 (6), p.061101-061101, Article 061101
Main Author: Olmo, Gonzalo J
Format: Article
Language:English
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Summary:We show that the metric in f(R) theories of gravity in Palatini formalism can be solved as the product of a rank-two tensor times a scalar function which is very sensitive to the local energy-momentum densities. This local dependence of the metric generates new gravitationally-induced microscopic interactions, which eventually would lead to self-accelerated test body trajectories. These facts make very unlikely the viability of Palatini f(R) models designed to change the late-time cosmic evolution.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.98.061101