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Science: Gravity as a Communications Mechanism?

Does gravity move at the speed of light? For instance, if I were able to change some energy into matter, how long would it take for other matter to begin to feel the attraction of the matter I created? I assume someone out there knows the answer.

If you could convert energy to matter and back again in an amazingly concise manner, and do it at a specific frequency, and if you could detect such changes in gravity at a specific frequency, you could conceivably use gravity as a communications mechanism. That's not likely to happen during my lifetime, but it does make for some interesting science fiction.

Comments

Basu said…
Yes, gravity does "travel" at the speed of light. But I feel like Gravitional communication would be an incredibly wasteful method of communication. A simple laser beam would get the same speed for far less cost. Good idea though.
metapundit.net said…
I guess it's back to work on your quantum entanglement walkie-talkie.
Eddy Mulyono said…
that would make an interesting covert channel...
From Jesse Montrose:

I put that idea into my (still unfinished) NaNoWriMo novel last year :)

But I just read this:

http://math.ucr.edu/home/baez/physics/Relativity/GR/grav_speed.html
aheld said…
In David Weber's Honor Harrington series the 'good guys' develop this an a FTL communications system.

Good concept
Keith said…
Well, there is at least a way to turn matter into energy. It's sort of like a one-way hash, however. It's also called an "atomic bomb". ;-)
While it's true that an atomic bomb does indeed send a message, it's not quite the communications mechanism I had in mind ;)