Asymptotic Freedom Cosmology

Abstract

For a general class of scalar--tensor gravity theories, we discuss how to recover asymptotic freedom regimes when cosmic time $t\to \pm \infty$. Such a feature means that the effective gravitational coupling $G_{eff}\to 0$, while cosmological solutions can asymptotically assume de Sitter or power--law behaviours. In our opinion, through this mechanism, it is possible to cure some shortcomings in inflationary and in string--dilaton cosmology.

9 pages, Latex, submitted to Phys. Lett. A