Magnetic monopoles with an internal degree of freedom

Abstract

We consider a class of spontaneously broken $SU(2)$ gauge theories with adjoint scalar and look for exact magnetic monopole solutions in the Bogomol'nyi-Prasad-Sommerfield (BPS) limit. We find that some of the resulting solutions exhibit a new internal degree of freedom (a moduli space parameter) that controls the energy density profile of the monopole while keeping the total energy (mass) constant.

Comments: 11 pages, 5 figures; revised version with a reference added; minor typos corrected; version published in PTEP