No horizons in pp-waves

Veronika E Hubeny, Mukund Rangamani
2002 Journal of High Energy Physics  
We argue that pp-wave backgrounds can not admit event horizons. We also comment on pp-wave generalizations which would admit horizons and show that there exists a black string solution which asymptotes to a five dimensional plane wave background.
doi:10.1088/1126-6708/2002/11/021 fatcat:xetgfkckmzb4bjmgrnrqqcp3sq