QUANTIZED-FIELDS AND TEMPERATURE IN CHARGED DILATONIC BLACK-HOLE SPACETIMES

The stress-energy tensor of a quantized scalar field is computed in th e reduced two-dimensional charged dilatonic black hole spacetime of Ga rfinkle, Horowitz, and Strominger. In order for the stress energy of q uantized fields to be regular on the event horizon in both the extreme string metric and the conformally associated physical metric, it is n ecessary to assign a nonzero temperature T=(8 pi e(phi 0)M)(-1) to the extreme string metric, contrary to the expectation that this horizonl ess spacetime would have a natural temperature of zero.