Supersymmetry and cosmic censorship

Abstract

We show that requiring unbroken supersymmetry everywhere in black-hole-type solutions of N=2,d=4 supergravity coupled to vector supermultiplets ensures in most cases absence of naked singularities. We show that the requirement of global supersymmetry implies the absence of sources for NUT charge, angular momentum, scalar hair and negative energy, for which there is no microscopic interpretation in String Theory. These conditions exclude, for instance, singular solutions such as the Kerr-Newman with M=|q|, which fails to be everywhere supersymmetric. There are, nevertheless, everywhere supersymmetric solutions with "global" angular momentum and non-trivial scalar fields. We also present similar preliminary results in N=1,d=5 supergravity coupled to vector multiplets.