New D1/D5 Black Holes from Scherk-Schwarz Reductions of Type IIB String Theory

Abstract

We study D1/D5 black holes in the context of Scherk-Schwarz reductions of type IIB string theory. In particular, we are interested in reductions that break the supersymmetry partially. We derive constraints on the parameters of the Scherk-Schwarz twist that need to be satisfied in order to obtain valid 3-charge black hole solutions in the reduced theory. We find that these constraints can only be satisfied by reductions that break the supersymmetry to N={0,4,8}, i.e. only these kinds of reductions lead to theories that support 3-charge D1/D5 black holes. The black holes that we construct in the N=0 and N=4 theories are unknown in previous classifications. We find valid D1/D5 solutions in N=2 and N=6 by taking the three charges to be equal. This results in the single charge Tangherlini black hole.