Naked Singularities in the Charged Vaidya-deSitter Spacetime
  We study the occurrence of naked singularities in the spherically symmetric collapse of a charged null fluid in an expanding deSitter background - a piece of charged Vaidya-deSitter spacetime. The necessary conditions for the formation of a naked singularity are found. The results for the uncharged solutions can be recovered from our analysis. 
A. Beesham and S. G. Ghosh