Non-minimally coupled theories of special potentials are analyzed numerically. Such theories yield equations of state $\omega<-1$ and oscillations of the cosmological expansion, which are favored by the recent analysis of observations. Fitting these theories to the Gold SnIa dataset, we obtain results comparable with other models. A potential of the form $V(\phi)=V_0e^{ a_1\phi^2}$ yields $\chi^2_{ min}=170.127$. Similar results are obtained for potentials of the form $V(\phi)=V_0+a_1\phi^n$.
Categories: astro-ph