2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/215807We revisit two-point function approaches used to study vacuum fluctuation in wedge-shaped regions and conical backgrounds. Appearance of divergent integrals is discussed and circumvented. The issue is considered in the context of a massless scalar field in cosmic string spacetime.REVTeX file, 7 pagesHigh Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext