We demonstrate the observational viability of having an exactly massless dilaton field couple with gravitational strength to most matter in the Universe. This is done by constructing a generalized Jordan-Brans-Dicke model in which the scalar couples with different strengths to visible and to conjectured ``dark'' matter. In this model, improved Ġ \.{G}{} measurements may provide nontrivial bounds on the coupling constants of the dilaton to matter.
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Damour et al. (1990) studied this question.
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