Tensor-scalar theories of gravity are shown to generically contain an attractor mechanism toward general relativity, with the redshift at the beginning of the matter-dominated era providing the measure for the present level of deviation from general relativity. Quantitative estimates for the post-Newtonian parameters {γ}-1, {β}-1, and G ̇ \.{}{}/G are given, which give greater significance to future improvements of solar-system gravitational tests.
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Damour et al. (1993) studied this question.
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