Electric dipole moment of a BPS monopole - art. no. 025002

Monopole "superpartner" solutions are constructed by acting with finite, br oken supersymmetry transformations on a bosonic N=2 BPS monopole. The terms beyond first order in this construction represent the back reaction of the fermionic zero-mode state on the other fields. Because of the quantum natu re of the fermionic zero modes, the superpartner solution is necessarily op erator valued. We extract the electric dipole moment operator and show that it is proportional to the fermion zero-mode angular momentum operator with a gyroelectric ratio g=2. The magnetic quadrupole operator is shown to van ish identically on all states. We comment on the usefulness of the monopole superpartner solution for a study of the long-range spin-dependent dynamic s of BPS monopoles. [S0556-2821(99)07412-3].