A Revised Proof of the Existence of Negative Energy Density in Quantum Field Theory

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148847Negative energy density is unavoidable in the quantum theory of field. We give a revised proof of the existence of negative energy density unambiguously for a massless scalar field.7 pages, RevTeX file, no figures, accepted by Nuovo Cimento ILGeneral Relativity and Quantum CosmologyA Revised Proof of the Existence of Negative Energy Density in Quantum Field Theorytext