The acceleration of a massive body in an external field for general space-time geometrical gravitational theories is obtained. The condition on the metric is such that mgmᵢ=1 is obtained, and we reobtain the result that mgmᵢ=1 in Einstein's theory for massive objects with time-independent internal structure. But it is shown that a measurement of mgmᵢ for astronomical bodies would measure space-time metric components which have not been measured in other gravitational experiments. In the scalar-tensor gravitational theory due to Brans and Dicke, it is shown that mgmᵢ differs from 1 by a term of the order of the massive body's gravitational self-energy divided by its total energy.
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Kenneth Nordtvedt (1968) studied this question.
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