[math-fun] "many interacting worlds" new quantum mechanics foundation?

Michael J. W. Hall, D.-A. Deckert, Howard M. Wiseman: Quantum phenomena modelled by interactions between many classical worlds http://journals.aps.org/prx/abstract/10.1103/PhysRevX.4.041013 http://arxiv.org/abs/1402.6144 Postulates there are a large, but finite, number of interacting "worlds." There is a "universal interworld potential function" which accomplishes the interaction. The word "unitary" never occurs in their paper, which strikes me as one big red sign saying "caveat emptor.". But I don't understand it. -- Warren D. Smith http://RangeVoting.org <-- add your endorsement (by clicking "endorse" as 1st step)