  We propose a new system for the study of event horizons and black holes - a
Bose-Einstein condensate of exciton-polaritons. Hawking radiation from a closed
horizon in 2D is observed in numerical experiments. We simulate inter-Universe
and intra-Universe wormholes capitalizing on the spinor nature of polariton
condensates and on the spin dependence of polariton-polariton interactions.
