Gravitationally bound monopoles

Phys Rev Lett. 2001 Feb 19;86(8):1422-5. doi: 10.1103/PhysRevLett.86.1422.

Abstract

We construct monopole solutions in SU(2) Einstein-Yang-Mills-Higgs theory carrying magnetic charge n. For vanishing and small Higgs self-coupling, these multimonopole solutions are gravitationally bound. Their mass per unit charge is lower than the mass of the n = 1 monopole. For large Higgs self-coupling only a repulsive phase exists.