CHARGED DILATONIC BLACK HOLES: STRING FRAME VERSUS EINSTEIN FRAME

Abstract

The descriptions of Reissner–Nordström and Kerr–Newman dilatonic black holes in the Einstein frame are compared to those in the string frame. We describe various physical measurements in the two frames and show which experiments can distinguish between the two frames. In particular we discuss the gyromagnetic ratios of black holes, the decay law via Hawking radiation and the propagation of light on black hole backgrounds.