Black diholes - art. no. 104009

We present and analyze exact solutions of the Einstein-Maxwell and Einstein -Maxwell-dilaton equations that describe static pairs of oppositely charged extremal black holes, i.e., black diholes. The holes are suspended in equi librium in an external magnetic field, or held apart by cosmic strings. We comment as well on the relation of these solutions to brane-antibrane confi gurations in suing and M theory.