The effect of conformal symmetry on charged wormholes
  This paper discusses the effect that conformal symmetry can have on a charged wormhole. The analysis yields a physical interpretation of the conformal factor in terms of the electric charge. The rate of change of the conformal factor determines much of the outcome, which ranges from having no solution to wormholes having either one or two throats. 
Peter K. F. Kuhfittig
gr-qc