5d/4d U-dualities and N=8 black holes

Abstract

We use the connection between the U-duality groups in d=5 and d=4 to derive properties of the N=8 black hole potential and its critical points (attractors). This approach allows to study and compare the supersymmetry features of different solutions.Comment: 23 pages, LaTeX; some notations cleared up; final version on Phys. Rev.