2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36215One-loop effects for quantum fields living on manifolds containing conical singularities are investigated in the context of cosmic string background and of finite-temperature theory in the Rindler wedge or outside the horizon of a Schwarzschild black-hole.LaTeX, 146 pages, 2 eps figures included. Ph.D. dissertationGeneral Relativity and Quantum CosmologyHigh Energy Physics - Theorytext