Naked singularities in four-dimensional string backgrounds.

  • Mohammedi
  • Published 1993 in Physical review. D, Particles and fields


It is shown that gauged nonlinear sigma models can be always deformed by terms proportional to the field strength of the gauge fields (nonminimal gauging). These deformations can be interpreted as perturbations, by marginal operators, of conformal coset models. When applied to the SL(2, R) × SU(2)/ (U(1)× U(1)) WZWN model, a large class of four-dimensional… (More)


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