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An immediate consequence of the fact that light signals actually travel
at infinite speed is that every individual particle in this Universe
must be entangled not just with some of its neighbours (in fact, across
space and time as it turns out), but with most (transitively) of the
other instances of the same particle along its own world line, i.e. as
soon as there are any mirrors around...
Where "self-entanglement along the world-line" seems to me a good
starting point for coherence conditions for retro-causation, aka a
solution to the Twin Paradox.
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