The wormholes and the Multiverse
  In this paper we construct a precise mathematical model of the Multiverse, consisted of the universes, that are connected with each other by dynamical wormholes. We consider spherically symmetric free of matter wormholes. At the same time separate universes in this model are not necessary spherically symmetric and can significantly differ from one another. We also analyze a possibility of the information exchange between different universes. 
I.D. Novikov, A.A. Shatskiy and D.I. Novikov
gr-qc