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It has frequently been claimed in the literature that the classical physical predictions of scalar tensor theories of gravity depend on the conformal frame in which the theory is formulated. We argue that this claim is false, and that all classical physical predictions are conformal-frame invariants. We also respond to criticisms by Vollick gr-qc/0312041, in which this issue arises, of our recent analysis of the Palatini form of 1/R gravity.
Éanna É. Flanagan (Wed,) studied this question.