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Originally posted by CSflim
I suppose so, but in that case we could send a "signal" faster than the speed of light. The limit of light speed applies, not only to physical things, but also to the propagation of any signal. In other words somthing can't "affect" another thing in a time less than the time it takes a beam of light to get there. But again, it could be that the limit only applies to a propagation in three dimensional space, but it still messes things up alot!
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But we can. The speed limit only applies to massive objects. If the speed limit is not broken there is no harm, no foul. Rather like if you run down the stairs and I stand still in the elevator and beat you to the lobby. Signals have been sent well in excess of the speed of light (links below). Things can be affected at any time, there is nothing (in mainstream theory at any rate) that prohibits it.
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I don't get what you are saying. Are you trying to say that you would travel back in time? How would that happen?
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Remember that time curves as well as space around massive objects. Traveling at relativistic speeds through a "shortcut" can, theoreticaly, displace you in time as well as space. Of course, as you mentioned, such shortcuts are extremely small and short lived, so unless you are the size of a muon, you don't have much to worry about.
http://www.space.com/scienceastronom..._c_000719.html
http://www.aip.org/physnews/update/536-2.html
http://www.newscientist.com/news/news.jsp?id=ns99992796