Phys. Rev. Lett. 98, 061101 (2007) [4 pages]Violation of the Equivalence Principle in Modified Theories of GravityReceived 6 December 2006; published 7 February 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.061101
DOI:
10.1103/PhysRevLett.98.061101
PACS:
04.50.+h, 04.25.Nx, 98.80.Es
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