Multidimensional SU(2) wormhole between two null surfaces
  The multidimensional gravity on principal bundle with structural SU(2) gauge group is considered. The Lorentzian wormhole solution disposed between two null surfaces is founded in this case. As the nondiagonal components are similar to a gauge fields (in Kaluza - Klein's sense) then in some sense this solution is dual to the black hole in 4D Einstein - Yang - MIlls gravity: 4D black hole has the stationary area outside of event horizon but multidimensional wormhole inside null surface (on which $ds^2=0$). 
V.D. Dzhunushaliev