Sending information is equivalent to storing information if you consider Galilean relativity (any experiment performed in a frame of reference moving at a constant speed is equivalent to the same experiment in a static frame of reference).
1: We mostly don’t need Gaililean relativity. If two events (meaning (space, time) points) are such that the first can causally affect the second (that is, if the second is in the future lightcone of the first) then there’s a frame (under special relativity) where the events happen at the same place but a different time, with an exception for if they are exactly separated by a lightspeed path (that is, on the edge of the lightcone) in that you have problems with the “frame” of a photon.
2: Suppose I make a “fiber optic square” where A sends a signal to B which sends to C which sends back to D. Say I can also flip a switch to let the signal out one side when I want to read it. This is basically a delay-line memory device.
There’s no single frame in which all the signals are stationary, even in Gaililean relativity—yet over the loop info goes from A,now to A,later. (the spacetime diagram would look like a helix).
I think this shows that’s it’s better to just think of info travelling along paths in spacetime instead of necessarily being one of “stored” or “sent”
Sending information is equivalent to storing information if you consider Galilean relativity (any experiment performed in a frame of reference moving at a constant speed is equivalent to the same experiment in a static frame of reference).
A couple things:
1: We mostly don’t need Gaililean relativity. If two events (meaning (space, time) points) are such that the first can causally affect the second (that is, if the second is in the future lightcone of the first) then there’s a frame (under special relativity) where the events happen at the same place but a different time, with an exception for if they are exactly separated by a lightspeed path (that is, on the edge of the lightcone) in that you have problems with the “frame” of a photon.
2: Suppose I make a “fiber optic square” where A sends a signal to B which sends to C which sends back to D. Say I can also flip a switch to let the signal out one side when I want to read it. This is basically a delay-line memory device.
There’s no single frame in which all the signals are stationary, even in Gaililean relativity—yet over the loop info goes from A,now to A,later. (the spacetime diagram would look like a helix).
I think this shows that’s it’s better to just think of info travelling along paths in spacetime instead of necessarily being one of “stored” or “sent”
Have you seen Harder Drive?