2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/199940The cosmological background of gravitational waves can be tuned by the higher-order corrections to the gravitational Lagrangian. In particular, it can be shown that assuming $R^{1+ε}$, where $ε$ indicates a generic (eventually small) correction to the Hilbert-Einstein action in the Ricci scalar $R$, gives a parametric approach to control the evolution and the production mechanism of gravitational waves in the early Universe.6 pages, 8 figuresGeneral Relativity and Quantum Cosmologytext