EXTREME BLACK-HOLE WITH AN ELECTRIC-DIPOLE MOMENT

We construct a new extreme black hole solution in a toroidally compact ified heterotic string theory. The black hole saturates the Bogomol'ny i bound, has zero angular momentum, but a nonzero electric dipole mome nt. It is obtained by starting with a higher-dimensional rotating char ged black hole, and compactifying one direction in the plane of rotati on.