2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/98418The nonperturbative renormalization group flow of Quantum Einstein Gravity (QEG) is reviewed. It is argued that there could be strong renormalization effects at large distances, in particular a scale dependent Newton constant, which mimic the presence of dark matter at galactic and cosmological scales.LaTeX, 6 pages, 1 figure. Talk given by M.R. at the 21st IAP meeting "Mass Profiles and Shapes of Cosmological Structures", Paris, July 4-9, 2005; to appear in the proceedingsAstrophysicsGeneral Relativity and Quantum CosmologyHigh Energy Physics - Theorytext