1208.2372 (Olivier Minazzoli)
Olivier Minazzoli
The effect of a universal scalar/matter coupling are investigated in Scalar-Tensor theories. It is shown that the metric can be put in its standard post-Newtonian form -- in contradiction with '$\gamma$ parameter and Solar System constraint in chameleon-Brans-Dicke theory', Phys. Rev. D 83, 104019 (2011), 1201.0271, Saaidi et al. However, assuming the validity of an effective Lagrangian for the matter field, it is pointed out that $1-\gamma$ could be either positive, null or negative for finite value of $\omega$, depending on the coupling function; while Scalar-Tensor theories without coupling always predict $\gamma<1$ for finite value of $\omega$.
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http://arxiv.org/abs/1208.2372
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