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*To*: starship-design@lists.uoregon.edu*Subject*: Re: starship-design: FTL and time travel*From*: "Kyle R. Mcallister" <stk@sunherald.infi.net>*Date*: Thu, 28 Aug 1997 16:51:31 -0700*References*: <9708282030.AA17235@bit.csc.lsu.edu> <340602AC.1C46@sunherald.infi.net> <199708282213.PAA05237@tzadkiel.efn.org>*Reply-To*: "Kyle R. Mcallister" <stk@sunherald.infi.net>*Sender*: owner-starship-design

Steve VanDevender wrote: > > Kyle R. Mcallister writes: > > Actually, the speed of light is not constant in a vacuum, but can be > > sped up...its too in depth to post, but it happens in a casimir cavity. > > Ask Steve, he knows more. > > Don't even try to make it look like I'll support you on this, Kyle, > because I won't. I don't think you know enough about the Casimir effect > to explain why it changes the speed of light, and I don't think you can > justify any sort of useful FTL effect based on it. I won't argue such a > thing, nor will I claim to know enough about the Casimir effect to try > to explain it to anyone. You told me it was caused by increasing the magnetic permeability of the vacuum. There's no need to go off the deep end, I wasn't intending to use this (not until we find a way to use something like it on a larger scale. Wouldn't a simple casimir cavity violate causality if you passed photon through it? > > > > >Unanswered question: If I travel 1600 light years in 2 years earth time, > > > >how far back in time do I travel upon return? > > > > > > It depends upon how much you accelerate away (sublight) from Earth > > > before returning. > > > > Lets say I navigate around the star system 1600 lightyears away for, say > > 5 years, and return to earth in 2 years earthtime. Is there an equation > > for this? > > > > Question: How do we know time runs backwards in FTL? Then again, how do > > we know time runs forward here... > > It isn't that time runs backward in FTL, it's that observers of a > hypothetical FTL trip won't agree on the direction that it proceeded > based on their measurements of the times and locations of each end of > the trip. Then I don't see why causality violation is such a big deal. A disagreement I can live with. Kyle Mcallister

**Follow-Ups**:**Re: starship-design: FTL and time travel***From:*Steve VanDevender <stevev@efn.org>

**References**:**Re: starship-design: FTL and time travel***From:*kuo@bit.csc.lsu.edu (Isaac Kuo)

**Re: starship-design: FTL and time travel***From:*"Kyle R. Mcallister" <stk@sunherald.infi.net>

**Re: starship-design: FTL and time travel***From:*Steve VanDevender <stevev@efn.org>

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