From Newsgroup: sci.physics.relativity
amirjf <
amirjfnin@aim.com> wrote or quoted:
Why is it so much more common to speculate about FTL motion of matter
than FTL waves/FTL communication?
I do not know, but it all boils down to the
/local speed of energy in a vacuum being limited to c/.
Matter has mass which is a form of energy, so it is subsumed by that.
Communication needs transfer of energy, so it also is subsumed.
Waves have several different concepts of speeds (like phase
velocity or group velocity), but the relevant speed of the
transfer of energy by the wave is subsumed.
The chatbot commented:
|FTL communication (often called the "Ansible" or subspace
|radio in sci-fi) and FTL waves (like tachyonic fields or
|Alcubierre warp bubbles) are speculated about just as much,
|if not more, than physically moving chunks of matter through
|space.
. In an entangled quantum system, internal information indeed
/is/ transferred FTL, but this does not involve transfer of
/energy/ nor can it be used by someone outside of the system
to transfer his /external information/. It can only be used for
the purpose of making the entangled behavior possible. So what
you get from it is entangled behavior, which cannot be used
to transfer energy nor your own information.
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