2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34544These lectures discuss how the direct detection of gravitational waves can be used to probe the very early Universe. We review the main cosmological mechanisms which could have produced relic gravitational waves, and compare theoretical predictions with capabilities and time scales of current and upcoming experiments.37 pages, 8 figures; typos correctedGeneral Relativity and Quantum CosmologyHigh Energy Physics - Theorytext