[ExI] Faster than light??

scerir scerir at alice.it
Sun Sep 25 09:49:55 UTC 2011

Adrian Tymes:
> I do not see why FTL automatically means time travel.

Maybe the question can be also re-stated as "Though there exist reference frames 
in which superluminal photons would reach detector, by the clock of an observer 
in this frame, earlier than they were emitted, is it impossible to send photons 
back to their source prior to their emission in the proper time of the source?".

There are papers trying to answer to that question.

More information about the extropy-chat mailing list