The general, duality-invariant family of non-BPS black-hole solutions of N=4, d=4 Supergravity

We present the most general family of stationary point-like solutions of pure N = 4, d = 4 Supergravity characterized by completely independent electric and magnetic charges, mass, angular momentum and NUT charge plus the asymptotic values of the scalars. It includes, for specific values of the charges, all previously known BPS and non-BPS, extreme and non-extreme black holes and Taub-NUT solutions. As a family of solutions, it is manifestly invariant under T and S duality transformations and exhibits a structure related to the underlying special geometry structure of the theory. Finally, we study briefly the black-hole-type subfamily of metrics and give explicit expressions for their entropy and temperature. (C) 2000 Elsevier Science B.V. All rights reserved.