Bogoliubov theory of the Hawking effect in Bose-Einstein condensates
  Artificial black holes may demonstrate some of the elusive quantum properties of the event horizon, in particular Hawking radiation. One promising candidate is a sonic hole in a Bose-Einstein condensate. We clarify why Hawking radiation emerges from the condensate and how this condensed-matter analog reflects some of the intriguing aspects of quantum black holes. 
U. Leonhardt, T. Kiss, P. Ohberg