From: Amara Graps (agraps@netcom.com)
Date: Tue Dec 17 1996 - 23:11:50 MST
>On Mon, 16 Dec 1996 Hal Finney <hal@rain.org> Wrote:
>
> >today there are several ideas for FTL travel, including
>
> >wormholes (discussed at length on this list a few years ago)
>
> >and the Alcubierre "warp drive".
>
>
>It seem that all these ideas need to invoke new physics, at least a little,
>at some point or another. For example, Kip Thorne's wormholes need
>"Exotic Material", that is, material that has a negative energy density
>from light's frame of reference. Nothing like Exotic Material has ever been
>observed and there is no theoretical reason to think it exists, but I admit
>there is no theoretical reason to think it doesn't either.
For the Alcubierre "warp drive", you need to create a "negative energy
density" behind the ship (essentially like anti-gravity, to "push" the
ship from behind). Alcubierre knew of no possible way to do this.
But there is a way- the "Casimir effect" - which may help solve this
problem. Surely someone told Alcubierre, because I think their
papers came out around the same time.
S. Weigert. "Spatial Squeezing of the Vacuum and the Casimir Effect",
Physics Letters A 1996 v214 #5-6 p.215-220.
The Casimir Effect is a weird quantum mechanical effect that results
in a negative energy. It is completely theoretical at this point, I
don't think that it has been verified in the lab.
(No, I had never heard of the Casimir Effect before a physics grad
student friend told me about it last week.)
Amara
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Amara Graps email: agraps@netcom.com
Computational Physics vita: finger agraps@best.com
Multiplex Answers URL: http://www.amara.com/
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"Steidzies le'na'm." (Make haste slowly.) --a Latvian proverb
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