2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186916The stress-energy tensor of a free quantized scalar field is calculated in the extreme Reissner-Nordström black hole spacetime in the zero temperature vacuum state. The stress-energy appears to be regular on the event horizon, contrary to the suggestion provided by two-dimensional calculations. An analytic calculation on the event horizon for a thermal state shows that if the temperature is nonzero then the stress-energy diverges strongly there.10 pages, REVTeX, 4 figures in separate uuencoded compressed fileGeneral Relativity and Quantum CosmologyHigh Energy Physics - Theorytext