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"Quantum mechanics deviates from classical physics in that instead of predicting with certainty the outcome of an observation, it predicts all possible outcomes and the probability of each. This, the authors claim, explains CTCs in a consistent way. Everett's many universes interpretation of this "randomness", which is very controversial though it prevails in some areas of study, says that if an event can physically happen with a certain probability, then it does---in some universe. Physical reality consists of a collection of universes, a multiverse, so to speak, that contains its own copy of the observation and its outcome. According to Everett, quantum theory predicts the subject probability of the outcome of the observation by prescribing the proportions of universes in which that outcome occurs.

Stanford Encyclopedia of Philosophy  http://plato.stanford.edu/entries/time-travel-phys/

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