A remark on Brans-Dicke dust cosmological solutions with negative   $\omega$
  Analysing the Brans-Dicke solutions for the dust phase, we show that, for negative values of $\omega$, they contain scenarios that display an initial subluminal expansion followed by an inflationary phase. We discuss these solutions with respect to the results of the observation of high redshif supernova as well as the age problem and structure formation. We stablish possible connections of these solutions with those emerging from string effective models. 
A.B. Batista, J.C. Fabris and R. de S\'a Ribeiro