Redirected from Alternate universe
The word "multiverse" has been proposed to refer to the collection of all universes.
Everett's "many-worlds" theory
Of the theories of parallel universes, that taken most seriously by modern physicists is the many worlds interpretation of quantum mechanics, proposed by Hugh Everett III[?] in 1956, or some minor modification of it. A champion of this theory is the Oxford-based physicist David Deutsch.
Time as a set of parallel universes
According to one theory, each time frame is related to a particular universe. For example, there is a parallel universe where the First World War is being fought and another where the Second World War is being fought. Similarly, there is a universe where the 4th millennium has dawned. Time travel, according to this theory, is merely travelling from one parallel universe to the other. This may be achievable by passing through a wormhole.
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