2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/207678We 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.13 pagesHigh Energy Physics - Phenomenologytext