Quantisation of monopoles with non-abelian magnetic charge

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Abstract

Magnetic monopoles in Yang-Mills-Higgs theory with a non-abelian unbroken gauge group are classified by holomorphic charges in addition to the topological charges familiar from the abelian case. As a result the moduli spaces of monopoles of given topological charge are stratified according to the holomorphic charges. Here the physical consequences of the stratification are explored in the case where the gauge group SU(3) is broken to U(2). The description due to Dancer of the moduli space of charge-two monopoles is reviewed and interpreted physically in terms of non-abelian magnetic dipole moments. Semi-classical quantisation leads to dyonic states which are labelled by a magnetic charge and a representation of the subgroup of U(2) which leaves the magnetic charge invariant (centraliser subgroup). A key result of this paper is that these states fall into representations of the semi-direct product U(2) times sign with bar connected to left of it R-4, The combination rules (Clebsch-Gordan coefficients) of dyonic states can thus be deduced. Electric-magnetic duality properties of the theory are discussed in the light of our results, and supersymmetric dyonic BPS states which fill the SL(2,Z) orbit of the basic massive W-bosons are found.

Original languageEnglish
Pages (from-to)250-294
Number of pages45
JournalNuclear Physics B
Volume512
Issue number1-2
DOIs
Publication statusPublished - 16 Feb 1998

Keywords

  • non-abelian magnetic monopoles
  • monopole moduli spaces
  • monopole quantisation
  • S-duality
  • SIMPLE GAUGE GROUPS
  • SU(3) MONOPOLES
  • FUNDAMENTAL MONOPOLES
  • NAHM EQUATIONS
  • BPS MONOPOLES
  • FIELD-THEORY
  • LOW-ENERGY
  • S-DUALITY
  • DYNAMICS
  • DIMENSIONS

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