Entropy for dilatonic black hole
arXiv:hep-th/9406210 · doi:10.1103/PhysRevLett.73.2521
Abstract
The area formula for entropy is extended to the case of a dilatonic black hole. The entropy of a scalar field in the background of such a black hole is calculated semiclassically. The area and cutoff dependences are normal {\it except in the extremal case}, where the area is zero but the entropy nonzero.
13 pages (Applicability of area formula justified and a reference added)