Moduli and monopoles Academic Article uri icon


  • String theory contains moduli fields—massless fields that move on string ground state manifolds 1. If supersymmetry is unbroken, these massless fields remain massless to all or- ders in perturbation theory, but it is assumed that all moduli obtain mass through non-perturbative interactions at some high scale, with perhaps a few exceptions. Among the many moduli the dilaton is particularly interesting because it deter- mines the string and gauge coupling. String moduli have only nonrenormalizable couplings to light fields and their typical range of variation is the Planck scale. Monopoles are one-dimensional topological defects that carry a magnetic charge, but their main relevant attribute is that they behave as stable non-relativistic NR particles see, for example, 2,3 . In addition to the good old grand unified theory GUT monopoles, there are many stringy monopoles, dyons and other exotic creatures 1. Since some grand sym- metry is expected to break into a …

publication date

  • January 1, 1999