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"...the expansion of the boundary conditions has its consequences: a new kind of quantum entanglement appears in the theory, mixing past and future, which is not present in conventional particle theory."
I would say it becomes a necessity, and, if not disproved, one hell of a leap in concepts and possibilities.
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I remember reading an entertaining time-travel scif novel set in a block universe: All of an Instant by Richard Garfinkle
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