2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34670These notes introduce the subject of quantum field theory in curved spacetime and some of its applications and the questions they raise. Topics include particle creation in time-dependent metrics, quantum origin of primordial perturbations, Hawking effect, the trans-Planckian question, and Hawking radiation on a lattice.Based on lectures given at the CECS School on Quantum Gravity in Valdivia, Chile, January 2002, 59 pages, 5 figures; v2 improved explanation of use of analyticity in Hawking effect derivation; v3 typo fixed in Fig.2General Relativity and Quantum CosmologyHigh Energy Physics - Theorytext