2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148359We compute the entropy of the Hawking radiation for an evaporating black hole, in 1+1 dimensions and in 3+1 dimensions. We investigate the validity of the semiclassical approximation for the evaporation process. It appears that there might be a large entropy of entanglement between the classical degrees of freedom describing the black hole and the radiation fields when the theory of quantum gravity plus matter is considered.9 pages, 1 figure (included), plain tex. (Section on quantum gravity is rewritten to explain basic ideas more clearly.)High Energy Physics - Theorytext