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It has frequently been claimed in the literature that the classical physicalpredictions of scalar tensor theories of gravity depend on the conformal framein which the theory is formulated. We argue that this claim is false, and thatall classical physical predictions are conformal-frame invariants. We alsorespond to criticisms by Vollick [gr-qc/0312041], in which this issue arises,of our recent analysis of the Palatini form of 1/R gravity.Comment: 9 pages, no figures, revtex; final published versio

The conformal frame freedom in theories of gravitation