General relativity as a cosmological attractor of tensor-scalar theories

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Abstract
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 Ġ/G are given, which give greater significance to future improvements of solar-system gravitational tests.

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