General Relativity as a Cosmological Attractor of Tensor-Scalar Theories

摘要

Tensor-scalar theories of gravity are shown to generically contain an attractormechanism 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 gamma-1, beta-1 and (G dot)/G are given, which give greater significance to future improvements of solar-system gravitational tests.