That's using John Wheeler's Multiverse concept for quantum uncertainty. Of course the question arises, where does all the energy come from to create each new alternate universe. One way out is what I call the pop-bead multiverse. At the big bang, and infinite number of universes were created, and time travel would simply be shifting from one alternate universe to another, exiting and re-entering the universes at different time points. <Shrug> Who knows?
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