2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/135785An encyclopedia article on mathematical aspects of quantum field theory in curved spacetime. Section titles are: Introduction and preliminaries; Construction of *-algebra for a real linear scalar field on globally hyperbolic spacetimes and some general theorems; Particle creation and the limitations of the particle concept; Theory of the stress-energy tensor; Hawking and Unruh effects; Non-globally hyperbolic spacetimes and the time-machine question; Other related topics and some warnings.21 pages, LaTeX (uses amssymb and epsf) 6 ps figures. In accordance with the Encyclopedia style, only 18 references included. 1. One short phrase inserted, 2. Error in authorship of 5th reference corrected, 3. One small mathematical typo corrected. (Corrections 1 and 2 were made in published version too.)General Relativity and Quantum Cosmologytext