A new solution for dilaton-Maxwell gravity

Abstract

An interesting static spherically symmetric solution corresponding to Einstein-Maxwell gravity coupled to a dilaton field with negative kinetic term has been obtained. This solution is characterized by the set of two arbitrary parameters, the physical massΜ 0 and electric chargeQ. It has two horizons on which the metric, scalar curvature and both dilaton and electromagnetic fields are regular. Another feature of this solution is that the physical mass is bounded by the electric charge asΜ 0≥√2¦Q¦ (unlike the Reisner-Nordstrom solution for whichΜ 0>-¦Q¦). The structure of the scalar curvature has been analyzed.