Phys. Rev. Lett. 52, 879–882 (1984)Stable Grand-Unified Monopoles with Multiple Dirac ChargeReceived 14 October 1983; published in the issue dated 12 March 1984 Magnetic monopoles with multiple Dirac charge are found to be stable in grand unified theories with symmetry breaking by an adjoint Higgs field under certain conditions. In the SU(5) model, the double, triple, quadruple, and sextuple monopoles are stable for a range of parameters in the Higgs potential. The effects of electroweak symmetry breaking on multiply charged monopoles are discussed. Evidence is also presented for the existence of a stable nonspherically symmetric quadruple monopole. © 1984 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.52.879
DOI:
10.1103/PhysRevLett.52.879
PACS:
14.80.Hv, 11.30.Qc, 12.10.En
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