[blendergeek]

No. That does not allow faster than light communication (which is impossible)

[MadnessASAP]

FTL communication is presumed to be impossible, it actually hasn't been proven impossible.

On the other hand, if it were shown to be possible it would be rather disruptive to many other presumptions in physics.

[dodobirdlord]

People are fairly attached to causality.

[bee_rider]

Supposing you transmit a message to me at a prearranged time, a number. At that prearranged time I pick a number at random, and act as if it is your message.

When I eventually get your message some time later, if it turns out my random pick was wrong, I kill myself. If the many worlds interpretation is right, I should only observe universes in which I’be managed to conjure up your message faster than causality, right?

[Ukv]

> If the many worlds interpretation is right, I should only observe universes in which I’be managed to conjure up your message faster than causality, right?

I feel that's pairing MWI with some non-physical (or at least beyond the wave function) overarching "I" that can see across or jump between branches of the wave function, whereas I'd claim the appeal of embracing MWI is largely that the universe's wave function is all there is and observers/consciousness play no special role (along with not having nonlocal random "collapses"). The experiment would be no different than gathering a bunch of people, assigning each a number, then killing the ones that were assigned the wrong number once the real number arrives.

[jdranczewski]

Long term, sure. Short term I think an unpleasant number of your parallel universe copies would observe themselves dying.