  We consider the minimal low-energy action for gravity up to six derivatives
which is renormalizable at the two-loop level modulo higher derivative
corrections. Then we study the classical solutions corresponding to the
Schwarzschild and the Robertson-Walker metrics. In the first case we find a
singularity close to the gravitational radius and in the second case we find
inflationary de Sitter solutions in absence of any matter or cosmological
constant.
