Local constraints on the oscillating G model - art. no. 047504

We analyze observational constraints on the effective Brans-Dicke parameter and on the temporal variation of the effective gravitational constant with in the context of the oscillating G model, a cosmological model based on a massive scalar field nonminimally coupled to gravity. We show that these lo cal constraints cannot be satisfied simultaneously once the values of the f ree parameters entering the model become fixed by the global attributes of our Universe. In particular, we show that the lower observational bound for the effective Brans-Dicke parameter and the upper bound of the variation o f the effective gravitational constant lead to a specific value of the osci llation amplitude which lies well below the value required to explain the p eriodicity of 128h(-1) Mpc in the galaxy distribution observed in the penci l beam surveys.