Originally posted by masterp
The current scientific theory is that information cannot travel faster than light, because otherwise there would be paradoxes.
Instantaneous communication means that the events of sending and receiving the information are simultaneous events at spacially separate locations.
"Simultaneous events at spacially separate locations in a given reference frame," means, "Light pulses emitted from the two events could be seen at
the same instant by a observer at the midway point between the events in the given reference frame." If that is not perfectly clear to you, then you
need to brush up on special relativity. Einstein did, indeed, prove that events at spacially separate locations cannot be simultaneous in all
reference frames. The alleged paradoxes come from scenarios in which information is assumed to travel faster than light in all directions in EVERY
rest frame, or at least in two reference frames whose relative motion is not perpendicular to the line of communication.
There is nothing paradoxical about (practically) instantaneous communication in every direction in one preferred rest frame, i.e. the ether. Proof of
instantaneous communication is proof of the existence of an immovable ether. If these experiments ever succeed in sending a question and getting back
a meaningful answer in less time that the 2-way light travel distance, then we'll have to burn all those books that swear there is no ether.
Viewed from any other reference frame (with velocity relative to the ether which is not perpendicular to the path of the communication), the
communication is NOT instantaneous. If sent in the direction of the reference frame's velocity relative to the ether, the message will arrive before
it is sent (according to clocks synchronized in the moving reference frame). The time shift due to relative motion is given by Einstein's formula,
t' = γ(t-(vx/c²)). Sent in the opposite direction, the time delay is equal and opposite by the same formula. If each half of a two-way
communication is instantaneous relative to the ether, then the whole two-way communication is perceived as instantaneous by both parties, irrespective
of their motion relative to the ether.
It's a fair guess that the CMB is stationary relative to the ether. The blueshift of the CMB in the direction of Virgo suggests that our solar system
is moving in that direction at approximately 627 km/s. That corresponds to a gamma of 1.0000022, and a time shift of 7 ns/km (i.e. 7 ps/m). If the
sender (A) is located 16 km farther from Virgo than the receiver (B), the instantaneous question from A should arrive at B about 112 ns before it is
sent (according to Earth clocks). If B returns an answer at the same instant that he receives the question, his response should arrive at A at the
same instant when A sends the question. Of course, there has to be a finite time lag for B to interpret the message, formulate the appropriate answer
and send it back. Putting this system to a practical test will require a distance greater than 16 km.
There is also the matter of locating a source of entangled photons. The source must be located closer to the sender than to the receiver. For 2-way
com, two sources are needed on opposite sides of the midway point, and there will be a speed-of-light delay for the distance between the two sources.
Setting up such a 2-way com between Earth and the moon would require sources of entangled photons midway between Earth and the moon. Satellites can be
placed in orbits which periodically pass near that mid-way point, but they cannot hover there.
For experimental purposes, perhaps you could use a photon source at L-1 and set up instantaneous 2-way com between L-4 and L-5. (Either Earth-moon
L-points or Earth-sun
would suffice.) If the L-points are ever colonized, instantaneous 2-way com between them would have
practical value. For now, it would merely prove the concept beyond any shadow of doubt.
If quantum entangled atoms can be harnessed for instantaneous communcation, perhaps they could be placed aboard a spacecraft on Earth and later
utilized for instantaneous 2-way com between Earth and Mars---without the necessity of placing a source midway between the stations.
"Enterprise to Earth: How's the political situation back there, since we went into hybernation? Oh, yea? Sorry to hear that; the whole human species
extinct? So who am I talking to?"