Journal
CLASSICAL AND QUANTUM GRAVITY
Volume 25, Issue 24, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/25/24/245017
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The connection between f(R) theories of gravity and scalar-tensor models with a 'physical' metric coupled to the scalar field is well known. In this work, we pursue the equivalence between a suitable scalar theory and a model that generalizes the f(R) scenario, encompassing both a non-minimal scalar curvature term and a non-minimum coupling of the scalar curvature and matter. This equivalence allows for the calculation of the PPN parameters beta and gamma and, eventually, a solution to the debate concerning the weak-field limit of f(R) theories.
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